Process for exchanging the anions of cationic compounds

ABSTRACT

Process for converting sparingly soluble salts of cationic organic compounds and inorganic acids into more readily soluble salts of organic acids, which process comprises: a) preparing a sparingly water-soluble salt of the cationic organic compound with the anion of an inorganic acid, b) adding thereto, in a monohydric aliphatic alcohol, an alkali metal salt or an organic acid, c) filtering off the resulting sparingly soluble alkali metal salt of the inorganic acid, and d) optionally converting the resulting solution into a solid form.

Cationic organic compounds are of great importance in various fields of chemistry and medicine, for example as dyes, UV absorbers, optical brighteners, soft-handle agents, pharmaceuticals or biocides.

The counterions of those products, i.e. the anions, normally play more of a secondary part as far as the actual mode of action is concerned. However, they are of the utmost importance to the solubility and often determine whether a product acquires commercial importance or not, it being a question in most cases of imparting maximum water solubility to the product, which offers the opportunity for the formulations of liquid preparations. However, it may also be of great interest to achieve the reverse, i.e. to increase the lipophilicity by the selection of a suitable anion, for example stearate.

However, the alkylating agents used for cationisation in the synthesis of cationic compounds mostly produce anions that impart to the products moderate to poor solubility in water, for example methyl sulfates or, especially, halides. Anions that render products readily soluble, on the other hand, are, for example, acetates, formates, lactates, methanesulfonates, tartrates, etc., for the direct preparation of which in synthesis there are no reagents. They must therefore be introduced subsequently by exchanging the “insoluble” anions. A large number of methods exist for solving that problem, but most can be applied to only very specific products and/or are not toxicologically safe and/or are uneconomic on a large scale.

It has now been found that exchanging the anions of cationic organic compounds can, surprisingly, be carried out very well by reaction with the alkali metal salts, especially the potassium salts, of the desired acids in low boiling alcohols. The cationic compound goes into solution together with the newly introduced anion, while the original anion precipitates in the form of the alkali metal salt, which is sparingly soluble in the alcohol, and can be removed by clarifying filtration.

Accordingly, the present invention relates to a process for converting sparingly soluble salts of cationic organic compounds and anions of inorganic acids into more readily soluble salts of organic acids, which process comprises

-   -   a) preparing a sparingly water-soluble salt of the cationic         organic compound with the anion of an inorganic acid,     -   b) adding thereto, in a monohydric aliphatic alcohol, an alkali         metal salt of an organic acid,     -   c) filtering off the resulting sparingly soluble alkali metal         salt of the inorganic acid, and     -   d) optionally converting the resulting solution into a solid         form.

There come into consideration as the cationic organic compounds, for example, UV absorbers, soft-handle agents for textiles, and antimicrobial agents, but especially optical brighteners and dyes.

The optical brighteners are, for example, those from the class of the stilbenes, bis-styryl-biphenyls, bis-benzofuranyl-biphenyls, bis-benzoxalyl-biphenyls, bis-benzimidazolyl derivatives, coumarin derivatives or pyrazoline derivatives.

Suitable cationic dyes are, for example, the compounds listed in the Colour Index under the headword “Basic Dyes”, the dyes described in K. Venkataraman “The Chemistry of Synthetic Dyes”, Vol. 4, Chap. 3-5, Academic Press, New York, 1971, and the numerous dyes containing a cationic group described in the patent literature. Preferred cationic dyes are, for example cationic acridin-, anthrachinon-, azin-, azo-, azomethin-, benzimidazol-, cyanin-, diazo-, dioxazin-, hydrazon-, ketoimin-, methin-, monoazo-, nitro-, oxazin-, polymethin-, quinolin-, thiazol-, triarylmetan- or xanthen dyes.

More preferred dyes for the process according to the invention are cationic oxazine dyes, mono- and disazo dyes, and hydrazon dyes.

Most preferred are dyes monoazo dyes of formula (1)

or hydrazon dyes of formula (2),

or diazo dyes of formula (3)

wherein

-   -   R₁ and R₂ are each independently of the other hydrogen,         C₁-C₄alkyl, halogen or nitro, preferably hydrogen,     -   R₃ and R₄ are each independently of the other unsubstituted         C₁-C₄alkyl or C₁-C₄alkyl substituted by OH, C₁-C₄alkoxy,         halogen, CN or by phenyl, preferably unsubstituted C₁-C₄alkyl,     -   X₁ and X₂ are each independently of the other hydrogen,         C₁-C₄alkyl, C₁-C₄alkoxy or halogen, preferably hydrogen,     -   R₅ is hydrogen or C₁-C₄alkyl,     -   R₆ is hydrogen, phenyl, C₁-C₁₂alkyl or C₅-C₈cycloalkyl, each of         which may be unsubstituted or substituted by OH, C₁-C₄alkoxy,         halogen, CN, R₆ is C₁-C₄alkyl substituted by phenyl, or by         C₅-C₈cycloalkyl,     -   or wherein R₅ and R₆, together with the nitrogen atom linking         them, form a piperazine ring which is substituted by C₁-C₈alkyl         or by phenyl on the nitrogen atom not bonded to the phenyl ring         or which is quaternised at that nitrogen atom by means of two         such groups, the C₁-C₈alkyl and phenyl radicals mentioned as         substituents on the nitrogen atom of the piperazine ring being         unsubstituted or substituted by OH, C₁-C₄alkoxy, halogen, CN or         by phenyl, and     -   wherein     -   R₇ and R₈ are each independently of the other a C₁-C₈alkyl         radical or an unsubstituted or substituted benzyl radical, and     -   R₉ is hydrogen, C₁-C₈alkyl, C₁-C₈alkoxy, cyanide or halide,         preferably hydrogen; and     -   n is a whole number in the range from 2 to 12, especially from 2         to 6;     -   and wherein X⁻ is an anion.

In the context of the present invention, alkyl radicals are understood as being straight-chain and branched alkyl radicals, for example methyl, ethyl, n- and iso-propyl and n-, sec- and tert-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl or dodecyl.

The alkyl radicals and the cycloalkyl radicals can be mono- or poly-substituted, for example by hydroxy, carboxy, halogen, cyano, phenyl or by C₁-C₄alkoxy.

The alkyl radicals can be interrupted by hetereoatoms, such as N; S or O.

The alkoxy radicals can contain from 1 to 12 carbon atoms, preferably from 1 to 4 carbon atoms. Examples of suitable alkoxy radicals are methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, isobutoxy, tert-butoxy, n-pentyloxy or n-hexyloxy. The alkoxy groups can likewise be substituted, for example by the groups mentioned as possible substituents for the alkyl radicals, especially by hydroxy or by C₁-C₄alkoxy.

For the process according to the invention, special preference is given to the dyes of formulae

wherein X⁻ is an anion.

The cationic dyes are known or can be prepared in a manner known per se.

Examples of anions of inorganic acids are halides, such as iodide, bromide and especially chloride, and also sulfate, borofluorate, hydrogen sulfate, methyl sulfate, phosphate and perchlorate.

The anions of organic acids are, for example, formate, acetate, propionate, butyrate, monochloroacetate, trifluoroacetate, tartrate, oxalate, maleate, acrylate, succinate, citrate, lactate, methanesulfonate and ethanesulfonate, with formate, acetate, propionate and trifluoroacetate being especially preferred.

Suitable alkali metal salts are, for example, lithium, sodium and potassium salts, with potassium salts being especially preferred.

The alkali metal salts can either be added directly or alternatively they can first be produced in the reaction solution by reacting the corresponding alkali metal carbonate or bicarbonate in situ with the desired acid.

The alkali metal salt of the organic acid is normally used in an equimolar amount or in a slight excess relative to the molar mass of the inorganic anion, generally from 1 to 1.3 mol of alkali metal salt per mol of inorganic anion.

Reacting the sparingly water-soluble salt of the cationic organic compound with the anion of an inorganic acid and the alkali metal salt of an organic acid is carried out, for example, at a temperature of approximately from 0° C. to the boiling temperature of the used alcohol, preferably from 15 to 100° C. and most preferably in the temperature range of the boiling point of the used alcohol.

The cationic compound is dissolved or suspended in the alcohol so that its concentration is, for example, approximately from 2 to 80% by weight, based on the total weight of the solution or suspension. The alkali metal salt of the organic acid is then added all at once or, preferably, in several portions.

Alcohols suitable for the process according to the invention are, for example, methanol, ethanol, n- and iso-propanol and also n-, iso- and tert-butanol. Special preference is given to methanol, ethanol and, especially, isopropanol.

When the reaction is complete, the alkali metal salt of the inorganic acid that has formed is separated off in the conventional manner, for example by filtration, optionally in the hot state or after cooling.

Customary, the alkali metal salt of the inorganic acid is separated in the hot state.

In general the separation is conducted by filtration.

Usually, after the filtration in the hot state, the filtrate is cooled and the desired compound crystallized. In general, the crystallized compound is then be isolated by filtration.

If the desired compound is also very soluble in the alcohol after cooling, it may be of advantage to remove the alcohol by distillation, optionally under reduced pressure. Decomposition of the organic cation is normally prevented thereby. In the case of products that are very sensitive to hydrolysis, it is recommended not to concentrate them to dryness by evaporation but to ensure that the dilution is always sufficient by addition of water before the end of the distillation. The aqueous solution can then optionally be lyophilised, if a dry product is required.

The newly formed alkali metal salt can optionally be separated off by crystallisation.

The resulting readily soluble salts of the cationic compound are suitable for the customary uses of cationic compounds, where, by virtue of their good solubility, especially in water, they permit the preparation of concentrated solutions.

The invention relates also to the salts of cationic dyes with organic acids. The dyes are preferably of the formulae

wherein

-   -   R₁ and R₂ are each independently of the other hydrogen,         C₁-C₄alkyl, halogen or nitro,     -   R₃ and R₄ are each independently of the other unsubstituted         C₁-C₄alkyl or C₁-C₄alkyl substituted by OH, C₁-C₄alkoxy,         halogen, CN or by phenyl,     -   X₁ and X₂ are each independently of the other hydrogen,         C₁-C₄alkyl, C₁-C₄alkoxy or halogen,     -   R₅ is hydrogen or C₁-C₄alkyl,     -   R₆ is hydrogen, phenyl, C₁-C₁₂alkyl or C₅-C₈cycloalkyl, each of         which may be unsubstituted or substituted by OH, C₁-C₄alkoxy,         halogen, CN, or R₆ is C₁-C₄alkyl substituted by phenyl or by         C₅-C₈cycloalkyl,     -   or wherein R₅ and R₆, together with the nitrogen atom linking         them, form a piperazine ring which is substituted by C₁-C₈alkyl         or by phenyl on the nitrogen atom not bonded to the phenyl ring         or which is quaternised at that nitrogen atom by means of two         such groups, the C₁-C₈alkyl and phenyl radicals mentioned as         substituents on the nitrogen atom of the piperazine ring being         unsubstituted or substituted by OH, C₁-C₄alkoxy, halogen, CN or         by phenyl, and     -   wherein     -   R₇ and R₈ are each independently of the other a C₁-C₈alkyl         radical or an unsubstituted or substituted benzyl radical, and     -   R₉ is hydrogen, C₁-C₈alkyl, C₁-C₈alkoxy, cyanide or halide,         preferably hydrogen; and     -   n is a whole number in the range from 2 to 12, especially from 2         to 6;     -   and     -   wherein X⁻ is formate, acetate, propionate, butyrate,         monochloroacetate, trifluoroacetate, tartrate, oxalate, maleate,         acrylate, succinate, citrate, lactate, stearate,         methanesulfonate or ethanesulfonate.

Special preference is given to dyes of formulae

wherein

-   -   X⁻ is formate, acetate, propionate, butyrate, monochloroacetate,         trifluoroacetate, tartrate, oxalate, maleate, acrylate,         succinate, citrate, lactate, stearate, methanesulfonate or         ethanesulfonate.

In addition, the cationic dyes of formula (1), (2) or (3) are used for the preparation of a liquid preparations, especially for the preparation of a liquid preparation for the dyeing of hair.

The dyes of formula (1), (2) or (3) according to the invention are suitable for dyeing natural or synthetic, organic material, such as keratin, wool, leather, silk, paper, glass fibres, cellulose, polyamides, polyacrylonitrile, especially keratin-containing fibres, such as human or animal hair, or cotton or nylon, and preferably human hair.

The multiplicity of shades of the dye, which results by the method according to the present invention, can be increased by combination with other dyes.

-   -   The present invention relates also to the colouration of hair         with a dye of formula (1), (2) or (3) according to the present         invention, and at least one further dye.

The dye of formula (1), (2) or (3) of the present invention can be combined with dyes of the same or different class of dyes, especially with direct dyes, oxidation dyes; dye precursor combinations of a coupler compound and a diazotized compound, or a capped diazotized compound; and/or cationic reactive dyes.

Direct dyes are natural or synthetic; they are uncharged, cationic or anionic, such as acid dyes.

Oxidation dye denotes also for oxidation dye precursors, which are from the group of the developer and coupler compounds. Wherein the coupler compounds denotes also to the addition salts thereof with an acid.

In the context of the present invention the single classes of dyes comprise the dyes defined in the Color Index of the Society of Textile Chemist and Colorist.

Further, in the context of the present invention, combinations comprising of a compound of formula (1), (2) or (3) are compositions, formulation and methods.

One preferred embodiment of the present invention is the combination of at least a single compound of formula (1), (2) or (3) with a direct dye, which are described in “Dermatology”, edited by Ch. Culnan, H. Maibach, Verlag Marcel Dekker Inc., New York, Basle, 1986, Vol. 7, Ch. Zviak, The Science of Hair Care, chapter 7, pages 248-250, and in “Europäisches Inventar der Kosmetikrohstoffe”, 1996, published by The European Commission, obtainable in diskette form from the Bundesverband der deutschen Industrie-und Handelsunternehmen für Arzneimittel, Reformwaren und Körperpflegemittel e.V., Mannheim.

More preferred direct dyes for the combination with at least a single compound of formula (1), (2) or (3), especially for semi permanent dyeing, are:

-   -   2-Amino-3-nitrophenol, 2-Amino-4-hydroxyethylamino-anisole         sulfate, 2-Amino-6-chloro-4-nitrophenol,         2-Chloro-5-nitro-N-hydroxyethylene-p-phenylendiamine,         2-Hydroxyethyl-picramic acid,         2,6-Diamino-3-((pyridine-3yl)-azo)pyridine,         2-Nitro-5-glyceryl-methylaniline,         3-Methylamino-4-nitro-phenoxyethanol,         4-Amino-2-nitrodiphenyleneamine-2′-carboxilic acid,         6-Nitro-1,2,3,4,-tetrahydroquinoxaline,         4-N-Ethyl-1,4-bis(2′-hydroxyethylamino-2-nitrobenzene         hydrochloride,         1-Methyl-3-nitro-4-(2′-hydroxyethyl)-aminobenzene,         3-Nitro-p-hydroxyethyl-aminophenol, 4-Amino-3-nitrophenol,         4-Hydroxypropylamine-3-nitrophenol,         Hydroxyanthryl-aminopropylmethyl morphlino methosulfat,         4-Nitrophenyl-aminoethylurea, 6-Nitro-p-toluidine, Acid Blue 62,         Acid Blue 9, Acid Red 35, Acid Red 87 (Eosin), Acid Violet 43,         Acid Yellow 1, Basic Blue 3, Basic Blue 6, Basic Blue 7, Basic         Blue 9, Basic Blue 12, Basic Blue 26, Basic Blue 99, Basic Brown         16, Basic Brown 17, Basic Red 2, Basic Red 22, Basic Red 76,         Basic Violet 14, Basic Yellow 57, Basic Yellow 9, Disperse Blue         3, Disperse Orange 3, Disperse Red 17, Disperse Violet 1,         Disperse Violet 4, Disperse Black 9, Fast Green FCF, HC Blue 2,         HC Blue 7, HC Blue 8, HC Blue 12, HC Orange 1, HC Orange 2, HC         Red 1, HC Red 10-11, HC Red 13, HC Red 16, HC Red 3, HC Red BN,         HC Red 7, HC Violet 1, HC Violet 2, HC Yellow 2, HC Yellow 5,         HC-Yellow 5, HC Yellow 6, HC Yellow 7, HC Yellow 9, HC Yellow         12, HC Red 8, Hydroxyethyl-2-nitro-p-toluidine,         N,N-Bis-(2-Hydroxyethyl)-2-nitro-p-phenylendiamine, HC Violet         BS, Picramic Acid, Solvent Green 7.

More preferred are combinations with cationic azo dyes, for example according to GB-A-2 319 776 as well as the oxazine dyes described in DE-A-299 12 327 and mixtures thereof with the other direct dyes mentioned therein.

Preferred direct dyes for the combination with at least a single compound of formula (1), (2) or (3) or a combination of at least a single compound of formula (1), (2) or (3) and oxidative dyes and oxidization agents, especially for semi permanent dyeing and permanent dyeing, are:

-   -   Disperse Violet 4, Picramic acid, N,N′-Bis-(2-Hydroxyethyl)         -2-nitro-p-phenylendiamine, HC Yellow No. 5, HC Blue No. 2, HC         Yellow No. 2, 2-Chloro-5-nitro-N-hydroxyethyl-p-phenylendiamine,         HC Red No. 3, 4-Amino-3-nitrophenol, Basic Blue 99,         2-Hydroxyethyl Picramic acid, HC Yellow No. 6,         Hydroxyethyl-2-nitro-p-toluidine,         2-Amino-6-chloro-4-nitrophenol,         4-Hydroxypropylamino-3-nitrophenol, Basic Red 2, HC Red No. 16         and HC Blue No. 16.

Further preferred cationic dyes for the combination with a compound of formula (1), (2) or (3) according to the present invention are described in the following references

-   -   in WO 95/01772, especially on page 2, line 7 to page 4, line 1,         and especially on page 4, line 35 to page 8, line 21 and on         pages 11 to 27, or     -   in WO 01/66646, especially on page 1, line 18 to page 3, line         16, and preferred from page 16, line 20 to page 22, and cationic         dyes as described on pages 10 to 17, or     -   in EP 970 685, especially on page 2, line 44 to page 9, line 56         and preferably on page 9, line 58 to page 48, line 12, or     -   direct dyes are described in DE-A-19 713 698, especially page 2,         line 61 to page 3, line 43, or     -   direct dyes and oxidizing agent are described in WO 97/20545,         especially on page 1, lines 4 to 10, in particular on page 3,         lines 24 to 32, and on page 11, line 6 to page 13, line 19,         especially with direct dyes are described on page 5, line 28 to         page 8, line 20, or     -   cationic dyes and anionic UV-absorbers are described in EP 1 166         752, especially on page 3, line 20 to page 4, line 21, in         particular with UV absorber on page 4, lines 26 to 3, and         especially on page7, line 47 to page 9, line 56.

More preferred for a combination with a cationic dye of formula (1), (2) or (3) are cationic dyes, such as Basic Yellow 87, Basic Orange 31 or Basic Red 51, or cationic dyes as described In WO 01/66646, especially cationic dye of example 4, or cationic dyes as described in WO 02/31056, especially cationic dye of example 6, compound of formula 106, or cationic dye of formula (3) as described in EP-A-714,954 or a yellow cationic dyes of formula (I)

wherein

-   -   R₁ and R₂ are each independently of the other a C₁-C₈alkyl         radical or an unsubstituted or substituted benzyl radical,     -   R₃ is hydrogen, C₁-C₈alkyl, C₁-C₈alkoxy, cyanide or halide,         preferably hydrogen, and     -   X⁻ is an anion, and preferably a compound of formula (I)     -   wherein     -   R₁ is methyl, R₂ is benzyl, R₃ is hydrogen, and X⁻ is an anion,         or     -   wherein     -   R₁ is benzyl, R₂ is benzyl, R₃ is hydrogen, and X⁻ is an anion,         or     -   wherein     -   R₁ is benzyl, R₂ is methyl, R₃ is hydrogen, and X⁻ is an anion,         which is defined as given above.

The process for the preparation of compounds of formula (I) comprises reacting a phenylhydrazine with a 4-pyridylaldehyde in the presence of an acid to form a hydrazone, which is optionally alkylated or benzylated.

Further preferred for a combination with a cationic dye of formula (1), (2) or (3) are cationic nitroaniline and anthraquinone dyes for the combination a compound of formula (1), (2) or (3) according to the invention, for example those described in the following patent specifications: U.S. Pat. No. 5,298,029, especially in column 2, line 33 to column 5, line 38; U.S. Pat. No. 5,360,930, especially in column 2, line 38 to column 5, line 49; U.S. Pat. No. 5,169,403, especially in column 2, line 30 to column 5, line 38; U.S. Pat. No. 5,256,823, especially in column 4, line 23 to column 5, line 15; U.S. Pat. No. 5,135,543, especially in column 4, line 24 to column 5, line 16; EP-A-818 193, especially on page 2, line 40 to page 3, line 26; U.S. Pat. No. 5,486,629, especially in column 2, line 34 to column 5, line 29; and EP-A-758 547, especially on page 7, line 48 to page 8, line 19.

In addition, preferred are combinations of a compound of formula (1), (2) or (3) according to the invention with further cationic dyes or with other dyes. Preferred are mixtures as given in the below references, with the proviso that one cationic dye is replaced by a compound of formula (1), (2) or (3) according to the present invention.

-   -   mixtures of at least two cationic dyes as described in WO         95/01772, especially on page 8, line 34 to page 10, line 22 with         the given preferences, or     -   combinations of Pyrazolo-[1,5-a]-pyrimidines with at least one         cationic dye as described in EP 998,908, especially on page 2,         line 34 to line 42, with preferred Pyrazolo-[1,5-a]-pyrimidines         as described in EP 998,908, especially on page 2, line 48 to         page 4, line 3, and with preferred cationic direct dyes as         described in EP 998,908, especially on page 4, line 22 to page         47, line 24, or     -   combinations of cationic dyes as described in FR-2788432,         especially on page 53, line 1 to page 63, line 23, especially a         combination of cationic dyes with Arianors in FR-2788432,         especially on pages 51 to 52, or especially a combination with         at least one Basic Brown 17, Basic brown 16, Basic Red 76 and         Basic Red 118, and/or at least one Basic Yellow 57, and/or at         least one Basic Blue 99, or     -   combinations of direct dyes and/or an oxidation dye and         oxidizing agents in the form of permanent-wave fixing solution,         especially with direct dyes as described in DE-A-19 713 698,         especially page 4, line 65 to page 35, line 59, or     -   combinations of cationic dyes and an oxidation dye of the         developer compound type and oxidizing agents as described in EP         850 638, especially on page 2, line 27 to page 7, line 46 and         preferred on page 7, line 20 to page 9, line 26, or     -   combinations of an extemporaneous mixture of a composition (A)         containing one or more oxidation dye precursors and optionally         one or more couplers, and of a composition (B), in powder form,         containing one or more direct dye, preferably cationic,         optionally dispersed in an organic pulverulent excipient and/or         a mineral pulverulent excipient, and a composition (C)         containing one or more oxidizing agent as described in U.S. Pat.         No. 6,190,421, especially in column 2, lines 2 to 1, and         preferably with oxidation dye precursors as described in column         2, line 35 to column 5, line 13, and preferably with direct dyes         as described in column 5, line 30 to column 7, line 14, or     -   a ready-to-use composition comprising, at least one oxidation         base, at least one cationic direct dye and at least one enzyme         of 2-electron oxidoreductase type in the presence of at least         one donor for the said enzyme as described in U.S. Pat. No.         6,228,129, especially in column 26, line 26 to column 27, line 9         with cationic direct dyes as described in column 8, line 17 to         column 13, line 65, especially those as described in column 20,         line 11 to line 19, in column 23, line 61 to column 24, line 25,         or     -   compositions of at least one direct cationic dye and at least         one nitrated benzene dye as described in WO 99/20235 on page 2,         line 1 to page 7, line 9, and on page 39, line 1 to page 40b         line 11, with cationic direct dyes as described on page 8, line         12 to page 25 line 6, and nitro benzene direct dyes as described         on page 26, line 7 to page 30, line 15, or     -   compositions of at least one direct cationic dye and at least         one autooxidisable oxidation dye, especially benzene, indol and         indoline derivatives as described in WO 99/20234, with in         preferred direct dyes as given on page 2, line 17 to page 26,         line 4, and autooxidisable oxidation dye as described especially         on page 26, line 10 to page 28, line 15, or     -   oxidation dyeing compositions of at least one direct dye and at         least one meta-Aminophenol derivative and at least one developer         compound and an oxidizing agent as described in EP 850 636,         especially on page 51 line 41 to page 7, line 52, and preferably         on page 19, line 50 to page 22, line 12, with preferred direct         dye as described on page 18, lines 1 and 2 in connection with         page 7, line 53 to page 17, line 55, and with preferred         meta-Aminophenol derivatives as described on page 7, line 47 to         line 52, and with preferred developer compounds as described on         page 6, line 10 to page 7, line 46, or     -   oxidation dyeing compositions of at least one direct dye and at         least one developer compound selected from the group of         para-Phenylenediamine derivatives and Bis-Phenylalkylenediamine         and, and at least one coupler compound selected from the group         of meta-Diphenols and an oxidizing agent, as described in         EP-A-850 637, especially on page 6, line 50 to page 8, line 44,         or     -   oxidation dyeing compositions with cationic couplers, as         described in WO 99/48856, especially on page 9, line 16 to page         13, line 8, and page 11, line 20 to page 12, line 13, or     -   cationic dye and e.g. a pyrazolo-(1,5-a)-pyrimidine derivatives,         as described in EP 998 908, especially on page 2, line 34 to         page 4, line 23, or     -   arianoren and/or oxidative dyes, as described in FR-2 788 432,         especially on page 2, line 16 to page 3, line 16, and page 5,         line 19 to page 14, line 8, and combinations with cationic dyes         as described on page 14, line 23 and following, or     -   oxidative dye precursors (unsaturated aldehyde and coupler         compounds), as described in German Patent Application 197 172         24, especially unsaturated aldehydes as described on page 2,         line 50 to line 66 and page 3 line 8 to line 12 are used as         developer compounds, and primary and secondary amino group         compounds, nitrogen-containing heterocyclic compounds, amino         acids, oligopeptids, aromatic hydroxy compounds, CH-active         compounds as described on page 3, line 42 to page 5 line 25 are         used as coupler compounds.

Further preferred for the combination with a compound of formula (1), (2) or (3) are cationic azo dyes, e.g. according to GB-A-2 319 776, as well as the oxazine dyes described in DE-A-29 912 327 and mixtures thereof with the other direct dyes mentioned therein.

More preferred for a combination with a cationic dye of formula (1), (2) or (3) are cationic dyes such as Basic Yellow 87, Basic Orange 31 or Basic Red 51, or as described in WO 01/66646, especially cationic dye of example 4, or as described in WO 02131056, especially cationic dye of example 6, compound of formula 106.

Especially preferred for a combination with a cationic dye of formula (1), (2) or (3) are direct dye mixtures comprising a dye of formula (1) of WO 01/66646, especially a direct dye of example 4, and/or or a dye of formula (2) of WO 02/31056, especially a direct dye of example 6, and/or Basic Yellow 87, and/or Basic Red 51, and/or Basic Orange 31.

No particular limitation is imposed on the acid dye used in the present invention so far as it is a water-soluble acid dye.

A further embodiment of the present invention concerns the combination of a compound of formula (1), (2) or (3) according to the invention with acid dyes, for example from the group of the compounds known by the international names (Color index), or trade names.

Preferred acid dyes for a combination with a cationic dye of formula (1), (2) or (3) are described in U.S. Pat. No. 6,248,314, they include Red Color No. 120, Yellow Color No. 4, Yellow Color No. 5, Red Color No. 201, Red Color No. 227, Orange Color No. 205, Brown Color No. 201, Red Color No. 502, Red Color No. 503, Red Color No. 504, Red Color No. 506, Orange Color No. 402, Yellow Color No. 402, Yellow Color No. 406, Yellow Color No. 407, Red Color No. 213, Red Color No. 214, Red Color No. 3, Red Color No. 104, Red Color No. 105(1), Red Color No. 106, Green Color No. 2, Green Color No. 3, Orange Color No. 207, Yellow Color No. 202(1), Yellow Color No. 202(2), Blue Color No. 202, Blue Color No. 203, Blue Color No. 205, Blue Color No. 2, Yellow Color No. 203, Blue Color No. 201, Green Color No. 201, Blue Color NO. 1, Red Color No. 230(1), Red Color No. 231, Red Color No. 232, Green Color No. 204, Green Color No. 205, Red Color No. 401, Yellow Color No. 403(1), Green Color No. 401, Green Color No. 402, Black Color No. 401 and Purple Color No. 401, especially Black Color No. 401, Purple Color 401, Orange Color No. 205.

These acid dyes may be used either single or in any combination thereof.

Preferably they are incorporated in dyeing composition for human hair in a proportion of 0.001-5% by weight (hereinafter indicated merely by “%”), particularly 0.005-4%, more particularly 0.2-3% based on the total weight of the composition, from the viewpoint of practical use in that a sufficient hair-dyeing effect is achieved, and the hand skin is scarcely smeared.

A further embodiment of the present invention concerns the combination of a compound of formula (1), (2) or (3) according to the invention with uncharged dyes, for example from the group of the nitroanilines, nitrophenylenediamines, nitroaminophenols, anthraquinones, indophenols, phenols, phenazines, phenothiazines, bispyrazolons or bispyrazol aza derivatives or methines.

In addition, the present invention concerns the combination of a compound of formula (1), (2) or (3) according to the invention with oxidation dyes.

Suitable oxidation dyes are described for example in

-   -   German Patent Application 19 94 450, especially on page 6, line         6 to line 64, or     -   German Patent Application 19 959 479, especially in column 2,         line 6 to column 3, line 11, or         -   in the series “Dermatology”, edited by Ch. Culnan, H.             Maibach, Verlag Marcel Dekker Inc., New York, Basle, 1986,             Vol. 7, Ch. Zviak, The Science of Hair Care, chapter 8, on             pages 264-267 (oxidation dyes), or     -   in German Patent Application 19 717 224; unsaturated aldehydes         as described on page 2, line 50 to line 66 and on page 3 line 8         to line 12 are used as developer compounds, and primary and         secondary amino group compounds, nitrogen-containing         heterocyclic compounds, amino acids, oligopeptids, aromatic         hydroxy compounds, CH-active compounds as described on page 3,         line 42 to page 5 line 8 are used as coupler compounds.

Preferred oxidation dye precursors of the developer type for a combination with a cationic dye of formula (1), (2) or (3) are for example primary aromatic amines, which are substituted in the para- or ortho-position with a substituted or unsubstituted hydroxy- or amino residue, or diaminopyridine derivatives, heterocyclic hydrazones, 4-aminopyrazol derivatives, 2,4,5,6-tetraaminopyrimidin derivatives, or unsaturated aldehydes as described in German Patent Application 19 717 224, especially on page 2, line 50 to line 66 and on page 3 line 8 to line 12, or cationic developer compounds as described in WO 00/43367, especially on page, 2 line 27 to page 8, line 24, in particular on page 9, line 22 to page 11, line 6.

Also very suitable for a combination with a cationic dye of formula (1), (2) or (3) according to the invention are developer dyes in their physiological compatible acid addition salt form, such as hydrochloride or sulfate. Developer dyes, which have aromatic OH substituents are also suitable in their salt form with base, such as alkalimetalphenolates.

Preferred developer compounds are:

-   -   1,4-diamino-benzene(p-phenylendiamine),         1,4-diamino-2-methyl-benzene(p-toluylen-diamine),         1,4-diamino-2,6-dimethyl-benzene,         1,4-diamino-2,5-dimethyl-benzene,         1,4-diamino-2,3-dimethyl-benzene, 2-chloro-1,4-diaminobenzene,         4-phenylamino-aniline, 4-di-methylamino-aniline,         4-diethylamino-aniline, hydroxyethyl-p-phenylendiamine,         1-(2′-hydroxyethyl)-2,5-diaminobenzene,         N,N-bis-(2-hydroxyethyl)-p-phenylendiamine,         4-[(2-methoxyethyl-)amino]-aniline,         4-[(3-hydroxypropyl)amino]-aniline,         hydroxypropyl-bis-(N-hydroxyethyl-p-phenylenediamine)hydrochloride,         1,4-diamino-2-(2-hydroxyethyl)-benzene,         1,4-diamino-2-(1-methylethyl)-benzene,         2-(2,5-diaminophenoxy)-ethanol,         1,3-bis[(4-aminophenyl)(2-hydroxyethyl)amino]-2-propanol,         bis-(2-hydroxy-5-aminophenyl)-methane,         1,4-bis-(4-aminophenyl)-diazacycloheptane,         1,8-bis(2,5-diaminophenoxy)-3,6-dioxaoctan,         1,10-bis-(2,5-diaminophenyl)-1,4,7,10-tetraoxadecane,         hydroxyethyl-3,4-methylenedioxyaniline, p-aminophenol,         o-aminophenol, m-aminophenol, 2-amino-6-methyl-phenol,         4-methylaminophenol sulfate, 4-amino-m-cresol, 6-amino-m-cresol,         6-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole,         2-amino-5-methyl-phenol, 4-amino-3-methylphenol,         4-methylamino-phenol, 2-aminomethyl-4-aminophenol,         4-amino-2-[(2-hydroxyethyl)-amino]methyl-phenol,         4-amino-2-(2-hydroxyethoxy)-phenol,         4-amino-2-(methoxymethyl)-phenol,         4-amino-2-(2-hydroxyethyl)-phenol,         2-hydroxymethylamino-4-aminophenol, bis-(4-aminophenyl)amine,         4-amino-3-fluorphenol, 2-hydroxymethyl-4-aminophenol,         4-amino-2-(diethylamino)-methyl)-phenol, 5-amino-salicylsäure,         2,5-diamino-pyridine, 2-amino-3-hydroxy-pyridine,         2,6-dimethoxy-3,5-diamino-pyridine,         2,4,5,6-tetraaminopyrimidine,         2-hydroxy-4,5,6-triaminopyrimidine,         4-hydroxy-2,5,6-triaminopyrimidine,         2,4-dihydroxy-5,6-diaminopyrimidine,         2-dimethylamino-4,5,6-triaminopyrimidine,         2,5,6-triamino-4-(1H)-pyrimidone, further 4,5-diaminopyrazol         derivatives as described in EP 0 740 741 or WO 94/08970,         especially 4,5-diamino-1-(2-hydroxyethyl)-1H-pyrazol,         4,5-diamino-1-(1-methylethyl)-1H-pyrazol,         4,5-diamino-1-[(4-methylphenyl)methyl]-1 H-pyrazol, 1         -[(4-chlorophenyl)methyl]-4,5-diamino-1 H-pyrazol,         4,5-diamino-1-methyl-1H-pyrazol.

More preferred developer dyes are p-phenylendiamine, p-toluylendiamine, p-aminophenol, m-aminophenol, o-aminophenol, N,N-bis-(2-hydroxyethyl)-p-phenylendiamine sulfate, 2-amino-4-hydroxyethylaminoanisole sulfate, hydroxyethyl-3,4-methylenedioxyaniline, 1-(2′-hydroxyethyl)-2,5-diaminobenzene, 2,6-dimethoxy-3,5-diamino-pyridine, hydroxypropyl-bis-(N-hydroxyethyl-p-phenylenediamine) hydrochloride, hydroxyethyl-p-phenylendiamine sulfate, 4-amino-3-methylphenol, 4-methylaminophenol sulfate, 2-aminomethyl-4-aminophenol, 4,5-diamino-1-(2-hydroxyethyl)-1H-pyrazol, 4-amino-m-cresol, 6-amino-m-cresol, 5-amino-6-chloro-cresol, 2,4,5,6-tetraaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 4-hydroxy-2,5,6-triaminopyrimidine sulfate.

Preferred oxidation dye precursors of the coupler type for a combination with a cationic dye of formula (1), (2) or (3) are for example m-phenylendiamine derivatives, naphthole, resorcine and resorcine derivatives, pyrazolone and m-aminophenol derivatives.

Especially preferred coupler compounds for a combination with a cationic dye of formula (1), (2) or (3) are N-(3-dimethylamino-phenyl)-urea, 4-amino-2-hydroxytoluene, 2-methyl-5-hydroxyethylaminophenol,

2,4-diaminophenoxyethanol, 2-amino-4-[(2-hydroxyethyl)amino]-anisole, p-aminophenol, m-aminophenol and its derivatives, especially 5-amino-2-methylphenol, 5-(3-hydroxypropylamino)-2-methylphenol, 3-amino-2-chloro-6-methylphenol, 2-hydroxy-4-aminophenoxyethanol, 2,6-dimethyl-3-aminophenol, 3-trifluoroacetylamino-2-chloro-6-methylphenol, 5-amino-4-chloro-2-methylphenol, 5-amino-4-methoxy-2-methyl-phenol, 5-(2′-hydroxyethyl)-amino-2-methylphenol, 3-(diethylamino)-phenol, N-cyclopentyl-3-aminophenol, 1,3-dihydroxy-5-(methylamino)-benzene, 3-(ethylamino)-4-methylphenol and 2,4-dichloro-3-aminophenol, or

-   -   o-aminophenol and its derivatives, such as 5-methyl-2-(1         -methylamino)-phenol, 3-di-methylaminophenol,         3-diethylamino-phenol, 5-amino-2-methyl-phenol,         5-amino-4-fluor-2-methyl-phenol,         5-amino-4-methoxy-2-methyl-phenol,         5-amino-4-ethoxy-2-methyl-phenol, 3-amino-2,4-dichlor-phenol,         5-amino-2,4-dichlor-phenol, 3-amino-2-methyl-phenol,         3-amino-2-chlor-6-methyl-phenol, 3-amino-phenol,         2-[(3-hydroxyphenyl)amino]-acetamide,         5-[(2-hydroxyethyl)amino]-2-methyl-phenol,         3-[(2-hydroxyethyl)amino]-phenol,         3-[(2-methoxyethyl)amino]-phenol, 5-amino-2-ethyl-phenol,         2-(4-amino-2-hydroxyphenoxy)-ethanol,         5-[(3-hydroxypropyl)amino]-2-methyl-phenol,         3-[(2,3-dihydroxypropyl)amino]-2-methyl-phenol,         3-[(2-hydroxyethyl)amino]-2-methyl-phenol, m-diaminobenzene and         its derivatives such as 2,4-diaminophenoxyethanol,         1,3-bis-(2,4-diaminophenoxy)-propane,         1-methoxy-2-amino-4-(2′-hydroxyethylamino)benzene,         1,3-bis-(2,4-diaminophenyl)-propane,         3-[(2-aminoethyl)amino]-aniline,         1,3-di(2,4-diaminophenoxy)-propane,         1,3-diamino-2,4-dimethoxy-benzene,         2,6-bis(2-hydroxyethyl)amino-toluene,         di(2,4-diaminophenoxy)-methane,         3-[di(2-hydroxyethyl)amino]-aniline,         2,6-bis-(2-hydroxyethylamino)-1-methylbenzene and         1-amino-3-bis-(2′-hydroxyethyl)-aminobenzene, o-diaminobenzene         and its derivatives such as 3,4-diaminobenzoic acid and         2,3-diamino-1-methylbenzene,         2,4-diamino-1-fluor-5-methyl-benzene,         2,4-diamino-1-methoxy-5-methyl-benzene,         1-(2-aminoethoxy)-2,4-diaminobenzene,         2-amino-1-(2-hydroxyethoxy)-4-methylamino-benzene,         2,4-diaminophenoxy-acetic acid,         2,4-diamino-1-ethoxy-5-methyl-benzene,         3-[(2-hydroxyethyl)amino]-aniline, 3,4-diamino-benzoic acid,         3,4-dihydro-6-hydroxy-1,4(2H)-benzoxazine,         6-amino-3,4-dihydro-1,4(2H)-benzoxazine,         2,4-diamino-1,5-di(2-hydroxyethoxy)-benzene,         2,4-diamino-1-(2-hydroxyethoxy)-5-methyl-benzene,         4-amino-2-di[(2-hydroxyethyl)amino]-1-ethoxy-benzene         2,4-di[(2-hydroxyethyl)amino]-1,5-dimethoxy-benzene,         3,4-dihydro-6-hydroxy-1,4(2H)-benzoxazine,         6-amino-3,4-dihydro-1,4(2H)-benzoxazine, di- or         trihydroxybenzene derivatives such as resorcine,         resorcinmonomethylether, 2-methylresorcine, 5-methylresorcine,         2,5-dimethylresorcine, 1-chloro-2,4-dihydroxy-benzene,         2-chlororesorcine, 4-chlororesorcine,         2,6-dihydroxyethylaminotoluene,         1,2-dichlor-3,5-dihydroxy-4-methyl-benzene,         1,5-dichlor-2,4-dihydroxy-benzene,         1,3-dihydroxy-2-methyl-benzene, pyrogallol and         1,2,4-trihydroxybenzene, pyridine derivatives such as         2,6-diamino-pyridine, 2,6-dihydroxypyridine,         2-amino-3-hydroxypyridine, 2-amino-5-chloro-3-hydroxypyridine,         5-amino-4-chloro-2-methyl-phenol, 3-diamino-6-methoxy-pyridine,         3-amino-2-methylamino-6-methoxypyridine,         2,6-dihydroxy-3,4-dimethylpyridine,         2,6-dihydroxy-4-methylpyridine, 2,6-diaminopyridine,         2,3-diamino-6-methoxypyridine,         2,6-diamino-3,5-dimethoxy-pyridine, and         3,5-diamino-2,6-dimethoxypyridine, naphthaline derivatives such         as 1-naphthol, 2-methyl-1-naphthol, 2-hydroxymethyl-1-naphthol,         2-hydroxyethyl-1-naphthol, 1,5-dihydroxynaphthaline,         1,6-dihydroxynaphthaline, 1,7-dihydroxynaphthaline,         1,8-dihydroxynaphthaline, 2,7-dihydroxynaphthaline and         2,3-dihydroxynaphthaline, 2-methyl-1-naphthol-acetat, morpholine         derivatives such as 6-hydroxybenzomorpholine and         6-aminobenzomorpholine, chinoxaline derivatives such as         6-methyl-1,2,3,4-tetrahydrochinoxaline, pyrazol derivatives such         as -phenyl-3-methylpyrazol-5-one,         3-methyl-1-phenyl-5-pyrazolone, indol derivatives such as         4-hydroxyindol, 5-hydroxy-indol, 6-hydroxyindol and         7-hydroxyindol, 2,3-indolindione, 5,6-dihydroxy-indol,         5,6-dihydroxy-indoline, methylendioxybenzene derivates such as         1-hydroxy-3,4-methylendioxybenzene,         1-amino-3,4-methylendioxybenzene and         1-(2′-hydroxyethyl)-amino-3,4-methylendioxybenzene,         3,4-methylendioxy-phenol, 3,4-methylendioxy-aniline,         5-[(2-hydroxyethyl)amino]-1,3-benzodioxol,         6-brom-1-hydroxy-3,4-methylendioxy-benzene, or cationic coupler         compounds as described in FR 2 794 644, especially on page 11,         line 20 to page 15, line 34, and on page 17, lines 4 to 12, page         178, line 33 to page 18, line 24.

More especially preferred coupler compounds for a combination with a cationic dye of formula (1), (2) or (3) are toluene-2,5-diamine sulfate, 1-naphthol, 1,5-, 2,7- and 1,7-dihydroxynaphthaline, 3-aminophenol, 5-amino-2-methylphenol, 2-amino-3-hydroxypyridine, resorcinol, 4-chlororesorcine, 2-chloro-6-methyl-3-aminophenol, 2,6-dihydroxy-ethylaminotoluene, 2-methyl-5-dihydroxyethylaminophenol, 2,4-diaminophenoxyethylol hydrochloride, 2-methylresorcine, 5-methylresorcine, 2,5-dimethylresorcine, 3,4-methylenedioxyphenol, 2-amino-4-hydroxyethylaminoanisole sulfate, 2,6-di-(beta-hydroxy-ethylamino)-toluene, 4-amino-2-hydroxytoluene, 6-hydroxyindol, 2-amino-3hydroxypyridine, 2,6-dimethoxy-3,5-pyridinediamine hydrochloride and 2,6-dihydroxy-3,4-dimethylpyridine.

Most preferred coupler compounds for a combination with a cationic dye of formula (1), (2) or (3) are 2-chloro-6-methyl-3-aminophenol, 5-amino-2-methylphenol, 2-amino-3-hydroxypyridine, 2,6-di-(beta-hydroxyethylamino)-toluol, 2-methylresorcine and 1-naphthol.

Further, preferred for a combination with a cationic dye of formula (1), (2) or (3) are:

-   -   the developer/-coupler combination 2,4,5,6-Tetraaminopyrimidine         and 2-Methylresorcine are preferred for assessing of red shades,         or     -   p-Toluenediamine and 4-Amino-2-hydroxytoluene for assessing of         blue-violet shades, or         -   p-Toluenediamine and 2-Amino-4-hydroxyethylaminoanisole for             assessing of blue shades, or     -   p-Toluenediamine and 2,4-Diamino-phenoxyethynol for assessing of         blue shades, or     -   3-Methyl-4-aminophenol and 4-Amino-2-hydroxytlouene for         assessing of orange shades, or     -   p-Toluenediamine and resorcine for assessing of brown-green         shades, or     -   p-Toluenediamine and 1-Naphthol for assessing of blue-violet         shades, or     -   p-Toluenediamine and 2-methylresorcine for assessing of         brown-gold shades.

Further, one preferred embodiment of the present invention concerns the combination of a compound of formula (1), (2) or (3) according to the present invention with autooxidizable compounds, such as, for example benzene, indol, or indoline, especially 5,6-dihydroxyindol or 5,6-dihydroxyindoline derivatives as described in WO 99/20234, especially on page 26, line 10 to page 28, line 15, or in WO 00/28957 on page 2, third paragraph.

Preferred autooxidizable benzene derivatives for a combination with a cationic dye of formula (1), (2) or (3) are:

-   -   1,2,4-trihydroxybenzene, 1-methyl-2,4,5-trihydroxybenzene,         2,4-diamnio-6-methylphenol, 2-amino-4-methylaminophenol,         2,5-diamino-4-methyl-phenol, 2,6-diamino-4-diethylamino-phenol,         2,6-diamino-1,4-dihydroxybenzen, and the salts of these         compounds, which are accessible with acid.

Preferred autooxidizable indol derivatives for a combination with a cationic dye of formula (1), (2) or (3) are:

-   -   5,6-dihydroxyindol, 2-methyl-5,6-dihydroxyindol,         3-methyl-5,6-dihydroxyindole, 1-methyl-5,6-dihydroxyindol,         2,3-dimethyl-5,6-dihydroxyindol, 5-methoxy-6-dihydroxyindol,         5-acetoxy-6-hydroixyindol, 5,6-diacetoxyindol, acid of         5,6-dihydroxyindol-2-carbonacid, and the salts of these         compounds, which are accessible with acid.

Preferred autooxidizable indoline derivatives for a combination with a cationic dye of formula (1), (2) or (3) are:

-   -   5,6-dihydroxyindoline, 1-methyl-5,6-dihydroxyindoline,         1-ethyl-5,6-dihydroxyindoline, and the salts of these compounds,         which are accessible with acid.

A compound of formula (1), (2) or (3) according to the present invention can also be combined with at least two different developers and at least one coupler compound, or with at least two different couplers and at least one developer compound. Such combinations are for example described in German Patent Application 197 172 24, especially on page 3, line 31 to page 5, line 8.

In addition, a compound of formula (1), (2) or (3) according to the present invention may also be combined with naturally occurring dyes, such as, for example, henna red, henna neutral, henna black, camomile blossom, sandalwood, black tea, Rhamnus frangula bark, sage, campeche wood, madder root, catechu, sedre and alkanet root. Such colouring methods are described, for example, in EP-A-404 868, especially on page 3, line 55 to page 4, line 9.

Further, a compound of formula (1), (2) or (3) may also be combined with capped diazotised compounds.

Capped diazonium compounds that come into consideration include, for example, antidiazotates of formula

diazosulfonates of formula

triazenes of formula

and also cyclic triazenes of formula

In formula (22) to (25):

-   -   A is the radical of an unsubstituted or substituted, aromatic or         heterocyclic aryl,     -   B is the radical of an unsubstituted or substituted,         water-soluble, aliphatic or aromatic aryl and     -   R is an unsubstituted or substituted alkyl group,     -   it being necessary for at least one of the groups to contain a         water-solubilising radical.

As a water-solubilising radical there comes into consideration, for example, SO₃H, COOH, OH or a quaternised ammonium radical of formula

wherein R₁, R₂ and R₃ are each independently of the others unsubstituted or substituted alkyl and An is an anion.

According to the invention, alkyl groups R, R₁, R₂ and R₃ are to be understood generally as open-chain or branched alkyl radicals, for example methyl, ethyl, n- and iso-propyl or n-, sec- and tert-butyl.

Such alkyl radicals may be mono- or poly-substituted, for example by hydroxy, carboxy, halogen, cyano or C₁-C₄alkoxy.

Preferably, the alkyl groups are unsubstituted and each has from 1 to 4, especially 1 or 2, carbon atoms.

As anion An there come into consideration both inorganic and organic anions, for example halide, such as chloride, bromide or iodide, sulfate, hydrogen sulfate, methyl sulfate, formate, acetate or lactate.

The anion is generally governed by the preparation process. Preferably, it is chloride, hydrogen sulfate, sulfate, methosulfate or acetate.

A is the radical of an unsubstituted or substituted, aromatic or heterocyclic aryl. Suitable radicals include, for example, unsubstituted or substituted radicals of benzene, radicals at position 1- or 2- of naphthalene, radical at position 2- of thiophene, radical at position 2- of 1,3-thiazole, radical at position 5- of 1,2-thiazole, radical at position 2- of 1,3-benzothiazole, radical at position 1- of 2,3-benzothiazole, radical at position 2- of aminoimidazole, radical at position 2- of 1,3,4-thiadiazole, radical at position 2- of 1,3,5-thiadiazole, radical at position 2- of 1,3,4-triazole, radical at positions 3-, 7- or 8- of pyrazole, radical at position 2- of benzimidazole, radical at position 2- of benzopyrazole, radical at positions 2- or 4- of pyridine, radical at positions 2-, 3-, 4-, 7- or 8- of quinoline, radical at position 2- of aminopyrimidine and radical at position 3- of aminoisoxazole, radical at position 5- of aminoquinoline, radical at position 4- of aminodiphenylamine, radical at position 2- of aminodiphenyl ether and radical at position 4- of aminoazobenzene.

Such radicals may be mono- or poly-substituted, for example by C₁-C₄alkyl, C₁-C₄alkoxy, C₁-C₄alkylthio, halogen, for example fluorine, bromine or chlorine, nitro, trifluoromethyl, CN, SCN, C₁-C₄alkylsulfonyl, phenylsulfonyl, benzylsulfonyl, di-C₁-C₄alkylaminosulfonyl, C₁-C₄-alkylcarbonylamino, C₁-C₄alkoxysulfonyl or by dihydroxy-C₁-C₄alkylaminosulfonyl.

B is the radical of an unsubstituted or substituted, water-soluble, aliphatic or aromatic aryl, suitable aliphatic aryls including especially those carrying a carboxylic acid or sulfonic acid group, for example starting materials for B radicals are: methylaminoacetic acid(sarcosine), methylaminobutyric acid, methylaminopropionic acid, ethylaminoacetic acid, ethylaminobutyric acid, 1 -methylaminoethane-2-sulfonic acid, 1 -ethylaminoethane-2-sulfonic acid and 1-methylaminopropane-3-sulfonic acid.

As starting materials for B radicals come into consideration especially aniline compounds and aminonaphthalene compounds, especially those carrying a carboxylic acid or sulfonic acid group. The amino group of such compounds may be unsubstituted but is preferably substituted, for example by unsubstituted or substituted C₁-C₄alkyl, suitable substituents thereof being especially hydroxy or carboxy.

Suitable coupling components include, for example, the coupling components customarily used for azo dyes and known from the relevant literature, for example those of the benzene series, the naphthalene series, the open-chain methylene-active compounds (for example acylacetarylamides) and the heterocyclic series.

The compounds of formula (22), (23), (24) and (25) are known, or can be prepared in a manner known per se.

The compounds of formula (23) wherein B is the radical of an aliphatic aryl are likewise known or can be prepared in a manner known per se.

The compounds of formula (27)

wherein

-   -   A is the radical of an unsubstituted or substituted,         water-soluble, aromatic or heterocyclic aryl,     -   B′ is the radical of an unsubstituted or substituted,         water-soluble, aliphatic or aromatic aryl, and     -   R is an unsubstituted or substituted alkyl group, can likewise         be prepared in a manner known per se.

For A and R, the definitions and preferred meanings indicated for formula (22) to (25) apply and, for B′, the definitions and preferred meanings indicated for B in formula (22) to (25) apply in so far as they relate to aromatic amines.

The compounds of formula (27) can be prepared, for example, by diazotising an amine of formula A-NH₂ in customary manner and coupling it to an amine of formula B′-NHR, there coming into consideration as amines B′-NHR only those compounds which couple at the nitrogen atom and not at a carbon atom of the aromatic ring. Such compounds are preferably aniline derivatives substituted in the 4 positions.

The present invention also describes formulations, which are used for the colouration of keratin fibres, especially human hair.

The formulations are applicable on human hair in different technical forms. The specific technical form may be chosen in view of the envisaged application and/or dye or dye composition. Technical forms of formulation are for example a solution, especially a thickened watery or watery alcoholic solution, a cream, foam, shampoo, powder, a gel, or an emulsion.

Preferred forms of formulations are ready to use compositions or a multi-compartment dyeing device or ‘kit’ or any of the multi-compartment packaging systems with compartments as described for example as described in U.S. Pat. No. 6,190,421, column 2, lines 16 to 31.

It is of advantage to prepare compositions of dyes, which are not stable to reduction, with oxidizing agent free compositions just before the dyeing process.

One preferred embodiment of the present invention concerns the formulation of dyes, especially those of formula (1), (2) or (3) in powder form.

The colouring compositions according to the invention may furthermore comprise any active ingredient, additive or adjuvant known for such preparations.

Adjuvants that are suitable for such formulations are in general customary in the field hair-colouring, such as for example surfactants or tensides, solvents, bases, acids, perfumes, polymeric adjuvant, thickeners and light stabilisers.

Preferred combinations of the colouring compositions according to the invention with adjuvant used in the colouring of hair, are

-   -   combination of direct dyes with oxidizing agents to achieve         lightened colouration; wherein oxidizing agents especially         described in WO 97/20545, especially page 9, lines 5 to 9,     -   combination of direct dyes and/or an oxidation dye and oxidizing         agents in the form of permanent-wave fixing solution, especially         oxidizing agents as described in DE-A-19 713 698, especially         page 4, lines 52 to 55, or EP-A-1 062 940, especially page 6,         lines 41 to 47, (and in the equivalent WO 99/40895),     -   oxidation dyes in the presence of oxidoreductase enzyme, as         described in WO 99/17730, especially page 4, line 11 to page 13,         line 28, and WO 99/36034, especially pages 3 to 15,     -   combination of cationic dyes with polyols or polyethers; polyols         or polyethers as described in EP-A-962 219, especially page 27,         lines 14 to 38,     -   thickening polymers, as described in EP-A-970 684, especially         page 48, line 16 to page 51, line 4,     -   sugar-containing polymers, as described in EP-A-970 687,         especially page 28, line 17 to page 29, line 23,     -   quaternary ammonium salts, as described in WO 00/10517,         especially page 44, line 16 to page 46, line 23,     -   anionic surfactants, as described in WO 00/10518, especially         page 45, line 11 to page 48, line 3,     -   non-ionic surfactants, as described in WO 00/10519, especially         page 45, line 11 to page 50, line 12, or     -   silicones, as described in WO 00/12057, especially page 45, line         9 to page 55, line 2.     -   oxidative agent or laser and direct dyes, as described in EP-920         856, especially on page 2, line 31 to page 53 line 36, and on         page 49, line 38 to page 50, line 41, with direct dyes as         described on page 3, line 54 to page 48, line 52, or     -   direct dyes in the presence of cationic amphotere, substantive         polymer, as described in EP-953 334, especially on page 2, line         39 to page 7, line 44, with direct dyes as described on page 8,         line 54 to page 27, line 16, and polymers as described on page         27, line 17 to page 30, line 14, or     -   direct dyes formulations with polymer thickener on the basis of         acrylic acid, as described in EP-970 685, especially on page 2,         line 39 to page 10, line 1, with direct dyes as described on         page 10, line 7 to page 48, line 15, with polymers as described         on page 48, line 17 to page 49, line 28.

The colouring composition according to the invention in many cases comprises at least one surfactant. Suitable surfactants are anionic, zwitterionic, ampholytic, non-ionic and cationic surfactants. In many cases, however, it has proved advantageous to select the surfactants from anionic, zwitterionic and non-ionic surfactants.

Anionic surfactants suitable for use in the colouring compositions according to the invention include all anionic surface-active substances that are suitable for use on the human body. Such substances are characterised by an anionic group that imparts water solubility, for example a carboxylate, sulfate, sulfonate or phosphate group, and a lipophilic alkyl group having approximately from 10 to 22 carbon atoms. In addition, glycol or polyglycol ether groups, ester, ether and amide groups and also hydroxy groups may be present in the molecule. The following are examples of suitable anionic surfactants, each in the form of sodium, potassium or ammonium salts or mono-, di- or tri-alkanolammonium salts having 2 or 3 carbon atoms in the alkanol group:

-   -   linear fatty acids having from 10 to 22 carbon atoms (soaps),     -   ether carboxylic acids of formula R—O—(CH₂—CH₂—O)_(x)—CH₂—COOH,         in which R is a linear alkyl group having from 10 to 22 carbon         atoms and x=0 or from 1 to 16,     -   acyl sarcosides having from 10 to 18 carbon atoms in the acyl         group,     -   acyl taurides having from 10 to 18 carbon atoms in the acyl         group,     -   acyl isothionates having from 10 to 18 carbon atoms in the acyl         group,     -   sulfosuccinic mono- and di-alkyl esters having from 8 to 18         carbon atoms in the alkyl group and sulfosuccinic         monoalkylpolyoxyethyl esters having from 8 to 18 carbon atoms in         the alkyl group and from 1 to 6 oxyethyl groups,     -   linear alkane sulfonates having from 12 to 18 carbon atoms,     -   linear α-olefin sulfonates having from 12 to 18 carbon atoms,     -   α-sulfo fatty acid methyl esters of fatty acids having from 12         to 18 carbon atoms,     -   alkyl sulfates and alkyl polyglycol ether sulfates of formula         R′—O(CH₂—CH₂—O)_(x′)—SO₃H, in which R′ is a preferably linear         alkyl group having from 10 to 18 carbon atoms and x′=0 or from 1         to 12,     -   mixtures of surface-active hydroxysulfonates according to DE-A-3         725 030, especially page 3, lines 40 to 55,     -   sulfated hydroxyalkylpolyethylene and/or         hydroxyalkylenepropylene glycol ethers according to DE-A-3 723         354, especially page 4, lines 42 to 62,     -   sulfonates of unsaturated fatty acids having from 12 to 24         carbon atoms and from 1 to 6 double bonds according to DE-A-3         926 344, especially page 2, lines 36 to 54,     -   esters of tartaric acid and citric acid with alcohols which are         addition products of approximately from 2 to 15 molecules of         ethylene oxide and/or propylene oxide with fatty alcohols having         from 8 to 22 carbon atoms, or     -   anionic surfactants, as described in WO 00/10518, especially         page 45, line 11 to page 48, line 3.

Preferred anionic surfactants are alkyl sulfates, alkyl polyglycol ether sulfates and ether carboxylic acids having from 10 to 18 carbon atoms in the alkyl group and up to 12 glycol ether groups in the molecule, and also especially salts of saturated and especially unsaturated C₈-C₂₂carboxylic acids, such as oleic acid, stearic acid, isostearic acid and palmitic acid.

Surface-active compounds that carry at least one quaternary ammonium group and at least one —COO⁽⁻⁾ or —SO₃ ⁽⁻⁾ group in the molecule are termed zwitterionic surfactants. Zwitterionic surfactants that are especially suitable are the so-called betaines, such as the N-alkyl-N,N-dimethylammonium glycinates, for example cocoalkyldimethylammonium glycinate, N-acylaminopropyl-N,N-dimethylammonium glycinates, for example cocoacylaminopropyldimethylammonium glycinate, and 2-alkyl-3-carboxymethyl-3-hydroxyethylimidazolines having from 8 to 18 carbon atoms in the alkyl or acyl group and also cocoacylaminoethylhydroxyethylcarboxymethyl glycinate. A preferred zwitterionic surfactant is the fatty acid amide derivative known by the CTFA name cocoamidopropyl betaine.

Ampholytic surfactants are to be understood as meaning surface-active compounds that, in addition to a C₈-C₁₈-alkyl or -acyl group, contain at least one free amino group and at least one —COOH or —SO₃H group in the molecule and are capable of forming internal salts. Examples of suitable ampholytic surfactants include N-alkylglycines, N-alkylpropionic acids, N-alkylaminobutyric acids, N-alkyliminodipropionic acids, N-hydroxyethyl-N-alkylamidopropyl-glycines, N-alkyltaurines, N-alkylsarcosines, 2-alkylaminopropionic acids and alkylaminoacetic acids, each having approximately from 8 to 18 carbon atoms in the alkyl group. Ampholytic surfactants to which special preference is given are N-cocoalkylaminopropionate, cocoacylaminoethylaminopropionate and C₁₂-C₁₈acylsarcosine.

Non-ionic surfactants are described in WO 00/10519, especially page 45, line 11 to page 50, line 12.

Non-ionic surfactants contain as the hydrophilic group, for example, a polyol group, a polyalkylene glycol ether group or a combination of polyol and polyglycol ether groups.

Such compounds are, for example:

-   -   addition products of from 2 to 30 mol of ethylene oxide and/or         from 0 to 5 mol of propylene oxide with linear fatty alcohols         having from 8 to 22 carbon atoms, with fatty acids having from         12 to 22 carbon atoms and with alkylphenols having from 8 to 15         carbon atoms in the alkyl group,     -   C₁₂-C₂₂ fatty acid mono- and di-esters of addition products of         from 1 to 30 mol of ethylene oxide with glycerol,     -   C₈-C₂₂alkyl-mono- and -oligo-glycosides and ethoxylated         analogues thereof,     -   addition products of from 5 to 60 mol of ethylene oxide with         castor oil and hydrogenated castor oil,     -   addition products of ethylene oxide with sorbitan fatty acid         esters,     -   addition products of ethylene oxide with fatty acid         alkanolamides.

Examples of cationic surfactants that can be used in the colouring compositions according to the invention are especially quaternary ammonium compounds. Preference is given to ammonium halides, such as alkyltrimethylammonium chlorides, dialkyldimethylammonium chlorides and trialkylmethylammonium chlorides, for example cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, distearyidimethy-lammonium chloride, lauryidimethylammonium chloride, lauryldimethylbenzylammonium chloride and tricetylmethylammonium chloride. Further cationic surfactants that can be used in accordance with the invention are quaternised protein hydrolysates.

Also suitable in accordance with the invention are cationic silicone oils, such as, for example, the commercially available products Q2-7224 (manufacturer: Dow Corning; a stabilised trimethylsilylamodimethicone), Dow Corning 929 emulsion (comprising a hydroxylamino-modified silicone, which is also referred to as amodimethicone), SM-2059 (manufacturer: General Electric), SLM-55067 (manufacturer: Wacker) and also Abil®-Quat 3270 and 3272 (manufacturer: Th. Goldschmidt; diquaternary polydimethylsiloxanes, quaternium-80), or silicones, as described in WO 00/12057, especially page 45, line 9 to page 55, line 2.

Alkylamidoamines, especially fatty acid amidoamines, such as the stearylamidopropyl-dimethylamine obtainable under the name Tego Amid® 18, are distinguished not only by a good conditioning action but also especially by their good biodegradability.

Quaternary ester compounds, so-called “esterquats”, such as the methyl hydroxyalkyl-dialkoyloxyalkylammonium methosulfates marketed under the trademark Stepantex®, are also very readily biodegradable.

An example of a quaternary sugar derivative that can be used as cationic surfactant is the commercial product Glucquat® 100, according to CTFA nomenclature a “lauryl methyl gluceth-10 hydroxypropyl dimonium chloride”.

The alkyl-group-containing compounds used as surfactants may be single substances, but the use of natural raw materials of vegetable or animal origin is generally preferred in the preparation of such substances, with the result that the substance mixtures obtained have different alkyl chain lengths according to the particular starting material used.

The surfactants that are addition products of ethylene and/or propylene oxide with fatty alcohols or derivatives of such addition products may either be products having a “normal” homologue distribution or products having a restricted homologue distribution. “Normal” homologue distribution is to be understood as meaning mixtures of homologues obtained in the reaction of fatty alcohol and alkylene oxide using alkali metals, alkali metal hydroxides or alkali metal alcoholates as catalysts. Restricted homologue distributions, on the other hand, are obtained when, for example, hydrotalcites, alkali metal salts of ether carboxylic acids, alkali metal oxides, hydroxides or alcoholates are used as catalysts. The use of products having restricted homologue distribution may be preferred.

Further preferred active ingredients of formulation according to thepresent invention, adjuvants and additives are as follows:

-   -   non-ionic polymers, for example vinylpyrrolidone/vinyl acrylate         copolymers, polyvinyl-pyrrolidone and vinylpyrrolidone/vinyl         acetate copolymers and polysiloxanes,     -   cationic polymers, such as quaternised cellulose ethers,         polysiloxanes having quaternary groups, dimethyidiallylammonium         chloride polymers, copolymers of dimethyldiallylammonium         chloride and acrylic acid, as available commercially under the         name Merquat® 280 and the use of which in hair colouring is         described, for example, in DE-A-4 421 031, especially page 2,         lines 20 to 49, or EP-A-953 334, especially page 27, line 17 to         page 30, line 11, acrylamide/dimethyldiallylammonium chloride         copolymers, diethyl-sulfate-quaternised dimethylaminoethyl         methacrylate/vinylpyrrolidone copolymers,         vinylpyrrolidone/imidazolinium methochloride copolymers,     -   quaternised polyvinyl alcohol,     -   zwitterionic and amphoteric polymers, such as, for example,         acrylamidopropyl-trimethylammonium chloride/acrylate copolymers         and octylacrylamide/methyl methacrylate/tert-butylaminoethyl         methacrylate/2-hydroxypropyl methacrylate copolymers,     -   anionic polymers, such as, for example, polyacrylic acids,         crosslinked polyacrylic acids, vinyl acetate/crotonic acid         copolymers, vinylpyrrolidone/vinyl acrylate copolymers, vinyl         acetate/butyl maleate/isobornyl acrylate copolymers, methyl         vinyl ether/maleic anhydride copolymers and acrylic acid/ethyl         acrylate/N-tert-butyl acrylamide terpolymers,     -   thickeners, such as agar, guar gum, alginates, xanthan gum, gum         arabic, karaya gum, locust bean flour, linseed gums, dextrans,         cellulose derivatives, e.g. methyl cellulose, hydroxyalkyl         cellulose and carboxymethyl cellulose, starch fractions and         derivatives, such amylose, amylopectin and dextrins, clays, e.g.         bentonite or fully synthetic hydrocolloids such as, for example,         polyvinyl alcohol,     -   structuring agents, such as glucose and maleic acid,     -   hair-conditioning compounds, such as phospholipids, for example         soya lecithin, egg lecithin, and cephalins, silicone oils, and         also conditioning compounds, for example such as those described         in DE-A-19 729 080, especially page 2, lines 20 to 49, EP-A-834         303, especially page 2, line 18 to page 3, line 2, or EP-A-312         343, especially page 2, line 59 to page 3, line 11,     -   protein hydrolysates, especially elastin, collagen, keratin,         milk protein, soya protein and wheat protein hydrolysates,         condensation products thereof with fatty acids and also         quaternised protein hydrolysates,     -   perfume oils, dimethyl isosorbitol and cyclodextrins,     -   solubilisers, such as ethanol, isopropanol, ethylene glycol,         propylene glycol, glycerol and diethylene glycol,     -   anti-dandruff active ingredients, such as piroctones, olamines         and zinc Omadine,     -   further substances for adjusting the pH value,     -   active ingredients such as panthenol, pantothenic acid,         allantoin, pyrrolidonecarboxylic acids and salts thereof, plant         extracts and vitamins,     -   cholesterol,     -   light stabilisers and UV absorbers, as described, for example,         in EP-A-819 422, especially page 4, lines 34 to 37,     -   consistency regulators, such as sugar esters, polyol esters or         polyol alkyl ethers,     -   fats and waxes, such as spermaceti, beeswax, montan wax,         paraffins, fatty alcohols and fatty acid esters,     -   fatty alkanolamides,     -   polyethylene glycols and polypropylene glycols having a         molecular weight of from 150 to 50 000, for example such as         those described in EP-A-801 942, especially page 3, lines 44 to         55,     -   complexing agents, such as EDTA, NTA and phosphonic acids,     -   swelling and penetration substances, such as polyols and polyol         ethers, as listed extensively, for example, in EP-A-962 219,         especially page 27, lines 18 to 38, for example glycerol,         propylene glycol, propylene glycol monoethyl ether, butyl         glycol, benzyl alcohol, carbonates, hydrogen carbonates,         guanidines, ureas and also primary, secondary and tertiary         phosphates, imidazoles, tannins, pyrrole,     -   opacifiers, such as latex,     -   pearlising agents, such as ethylene glycol mono- and         di-stearate,     -   propellants, such as propane-butane mixtures, N₂O, dimethyl         ether, C02 and air, and also     -   antioxidants,     -   polyols or polyethers, as described in EP-A-962 219, especially         page 27, lines 14 to 38,     -   thickening polymers, as described in EP-A-970 684, especially         page 48, line 16 to page 51, line 4,     -   sugar-containing polymers, as described in EP-A-970 687,         especially page 28, line 17 to page 29, line 23,     -   quaternary ammonium salts, as described in WO 00/10517,         especially page 44, line 16 to page 46, line 23.

In the context of the present invention, oxidizing agents are understood to be any oxidizing agent customarily used for oxidative hair colouring, for example dilute hydrogen peroxide solutions, hydrogen peroxide emulsions or hydrogen peroxide gels, alkaline earth metal peroxides, organic peroxides, such as urea peroxides, melamine peroxides, or alkalimetalbromat fixations are also applicable if a shading powder on the basis of semi-permanent, direct hair dyes is used.

Preferred oxidizing agent is hydrogen peroxide, preferred in about 2 to 30% by weight, more preferred in 3 to 20% by weight, and most preferred in 6 to 12% by weight of the total weight of a watery composition such as a solution, dispersion, a gel or emulsion.

The watery composition can comprise all customary components, which are used for the different applications of oxidizing agent compositions as described in K. Schrader, “Grundlagen und Rezepturen der Kosmetika”, 2. Aufl. (1989), page 832-840.

Further preferred oxidizing agents are

-   -   oxidizing agents to achieve lightened colouration, as described         in WO 97/20545, especially page 9, lines 5 to 9,     -   oxidizing agents in the form of permanent-wave fixing solution,         as described in DE-A-19 713 698, especially page 4, lines 52 to         55, and lines 60 and 61 or EP-A-1 062 940, especially page 6,         lines 41 to 47, (and in the equivalent WO 99/40895).

An oxidizing agents may be present in the colouring compositions according to the invention preferably in an amount of from 0.01% to 6%, especially from 0.01% to 1%, based on the total dyeing composition.

Preferred catalysts are metal ions, such as for example Zn²⁺, Cu²⁺, Fe²⁺, Fe³⁺, Mn²⁺, Mn⁴⁺, Li⁺, Mg²⁺, Ca²⁺ and Al³⁺, preferably Zn²⁺, Cu²⁺ and Mn²⁺.

The metal ions are applicable in any physiological suitable salts form. Preferred salts are acetate, sulfate, halogenide, lactate and tartrate.

Alkalimetalsulfits, such as sodium-, potassium-, lithium-sulfite, Alkalimetaldisulfits, such as sodium-, potassium-, lithium-disulfite, ascorbic acid, tert.-Butylhydrochinon and Ammoniumthiolactat.

In general, the coloration with an oxidative agent is conducted in the presence of a base. Bases are for example ammonia, alkali metal carbonates, earth metal carbonates, alkanol amines, such as for example mono-, di- or triethanolamine, alkali metal hydroxides, earth metal hydroxides, compounds of the formula

wherein,

-   -   R is a propyl residue, which substituted with OH or C₁-C₄-alkyl,     -   R₃, R₄, R₅ and R₆ are independently or dependently from each         other hydrogen, C₁-C₄-alkyl or hydroxy-(C₁-C₄)-alkyl.

Alkali metal is for example sodium, potassium or lithium.

Earth metal is for example magnesium or calcium.

Acids are inorganic or organic acids, such as hydrochloride, tartrat acid, citric acid, ascorbic acid and phosphor acid.

The use of UV absorbers can effectively protect natural and dyed hair from the damaging rays of the sun and increase the wash fastness of dyed hair.

Preferred UV absorbers the colouring compositions according to the invention are:

-   -   cationic benzotriazole UV absorbers as for example described in         WO 01/36396 especially on page 1, line 20 to page 2, line 24,         and preferred on page 3 to 5, and on pages 26 to 37, or     -   cationic benzotriazole UV in combination with antioxidants as         described in WO 01/36396, especially on page 11, line 14 to page         18, or     -   UV absorbers in combination with antioxidants as described in         U.S. Pat. No. 5 922 310, especially in column 2, lines 1 to 3,     -   UV absorbers in combination with antioxidants as described in         U.S. Pat. No. 4 786 493, especially in column 1, 42 to column 2,         line 7, and preferred in column 3, 43 to column 5, line 20, or     -   combination of UV absorbers as described in U.S. Pat. No. 5 830         441, especially in column 4, lines 53 to 56, or     -   combination of UV absorbers as described in WO 01/36396,         especially on page 11, lines 9 to 13, or     -   triazine derivatives provide effective UV protection as         described in WO 98/22447, especially on page 1, line 23 to page         2, line 4, and preferred on page 2, line 11 to page 3, line 15         and most preferred on pages 6 to 7, and 12 to 16, or     -   combination of the cosmetic formulations as described in WO         98/22447 with one or more than one further UV filter as         described in the following patents:

(Abbreviations T: table, R: row, Comp: compound, Ex: compound(s) of patent example, p=page; pp=pages) EP 895776 Comp. in Rows 48-58, p 3; R 25 + 33, p 5 WO 9220690 Polymeric comp in Examples 3-6 EP 1000950 Comp. in Table 1, pp 18-21 EP 1060734 T 1-3, pp 11-14 EP 1059082 Ex 1; T 1, pp 9-11 EP 1008586 Ex 1-3, pp 13-15 EP 1005855 T 3, p 13 EP 1129695 Ex 1-7, pp 13-14 EP 967200 Ex 2; T 3-5, pp 17-20 EP 945125 T 3 a + b, pp 14-15 EP 924246 T 2, p 9 EP 911020 T 2, p 11-12 EP 916335 T 2-4, pp 19-41 EP 852137 T 2, pp 41-46 EP 858318 T 1, p 6 EP 826361 T 1, pp 5-6 EP 503338 T 1, pp 9-10 WO 9301164 T 1 + 2, pp 13-22 EP 823418 Ex 1-4, pp 7-8 WO 9714680 Ex 1-3, p 10 EP 1027883 Compound VII, p 3 EP 832641 Ex 5 + 6 p 7; t 2, p 8 US 5338539 Ex 1-9, pp 3 + 4 EP 517103 Ex 3, 4, 9, 10 pp 6-7 EP 1123934 T 3, p 10 EP 1027883 Comp I-VI, p 3 EP 969004 Ex 5, T 1, pp 6-8 US 5801244 Ex 1-5, pp 6-7 EP 832642 Ex 22, T 3 pp, 10-15; T 4, p 16 US 5346691 Ex 40, p 7; T 5, p 8 (EP 570838) EP 517104 Ex 1, T 1, pp 4-5; Ex 8, T 2, pp 6-8 WO 200149686 Ex 1-5, pp 16-21 EP 944624 Ex 1 + 2, pp 13-15 EP 933376 Ex 1-15, pp 10-21 EP 863145 Ex 1-11, pp 12-18 EP 780382 Ex 1-11, pp 5-7 EP 626950 All examples EP 1081140 Ex 1-9, pp 11-16 WO 9217461 Ex 1-22, pp 10-20 WO 0168047 Tables on pp 85-96 EP 613893 Ex 1-5 + 15, T 1, pp 6-8 EP 1064922 Compounds 1-34, pp 6-14 EP 1028120 Ex 1-5, pp 5-13 EP 1008593 Ex 1-8, pp 4-5 EP 669323 Ex 1-3, p 5 EP 1108712 4,5-Dimorpholino-3-hydroxypyridazine JP 2000319629 CAS Regno. 80142-49-0, 137215-83-9, 307947-82-6 EP 420707 B1 Ex 3, p 13 (80142-49-0) US 5635343 All examples EP 1167358 All examples

A preferred embodiment of the present invention concerns the combination of a compound of formula (1), (2) or (3) with UV absorbers.

Preferred UV absorbers are described in WO 98/22447.

Preferred cosmetic formulations contain a combination of a compound of formula (1), (2) or (3) with UV absorbers and one or more than one further UV protective of the following substance classes:

-   -   p-aminobenzoic acid derivatives, for example         4-dimethylaminobenzoic acid 2-ethylhexyl ester;     -   salicylic acid derivatives, for example salicylic acid         2-ethylhexyl ester;     -   benzophenone derivatives, for example         2-hydroxy-4-methoxybenzophenone and its 5-sulfonic acid         derivative;     -   dibenzoylmethane derivatives, for example         1-(4-tert-butylphenyl)-3-(4-methoxyphenyl)-propane-1,3-dione;     -   diphenylacrylates, for example 2-ethylhexyl         2-cyano-3,3-diphenylacrylate, and 3-(benzofuranyl)         2-cyanoacrylate;     -   3-imidazol-4-ylacrylic acid and esters;     -   benzofuran derivatives, especially 2-(p-aminophenyl)benzofuran         derivatives, described in EP-A-582 189, U.S. Pat. No. 5,338,539,         U.S. Pat. No. 5,518,713 and EP-A-613 893;     -   polymeric UV absorbers, for example the benzylidene malonate         derivatives described in EP-A-709 080;     -   cinnamic acid derivatives, for example the 4-methoxycinnamic         acid 2-ethylhexyl ester and isoamyl ester or cinnamic acid         derivatives described in U.S. Pat. No. 5,601,811 and WO         97/00851; camphor derivatives, for example         3-(4′-methyl)benzylidene-bornan-2-one,         3-benzylidene-bornan-2-one, N-[2(and         4)-2-oxyborn-3-ylidene-methyl)-benzyl]acrylamide polymer,         3-(4′-trimethylammonium)-benzylidene-bornan-2-one methyl         sulfate,         3,3′-(1,4-phenylenedimethine)-bis(7,7-dimethyl-2-oxo-bicyclo[2.2.1]heptane-1-methanesulfonic         acid) and salts, 3-(4′-sulfo)benzylidene-bornan-2-one and salts;         camphorbenzalkonium methosulfate;     -   hydroxyphenyltriazine compounds, for example         2-(4′-methoxyphenyl)-4,6-bis(2′-hydroxy-4′-n-octyloxyphenyl)-1,3,5-triazine;         2,4-bis([4-(3-(2-propyloxy)-2-hydroxy-propyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine;         2,4-bis{[4-(2-ethyl-hexyloxy)-2-hydroxy]-phenyl}-6-[4-(2-methoxyethyl-carboxyl)-phenylamino]-1,3,5-triazine;         2,4-bis{[4-(tris(trimethylsilyloxy-silylpropyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine;         2,4-bis{[4-(2″-methylpropenyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine;         2,4-bis{[4-(1′,1′,1′,3′,5′,5′,5′-heptamethyltrisilyl-2″-methyl-propyloxy)-2-hydroxy-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine;         2,4-bis{[4-(3-(2-propyloxy)-2-hydroxy-propyloxy)-2-hydroxy]-phenyl}-6-[4-ethylcarboxy)-phenylamino]-1,3,5-triazine;     -   benzotriazole compounds, for example         2,2′-methylene-bis(6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)-phenol;     -   trianilino-s-triazine derivatives, for example         2,4,6-trianiline-(p-carbo-2′-ethyl-1′-oxy)-1,3,5-triazine and         the UV absorbers disclosed in U.S. Pat. No. 5,332,568, EP-A-517         104, EP-A-507 691, WO 93/17002 and EP-A-570 838;     -   2-phenylbenzimidazole-5-sulfonic acid and salts thereof;     -   methyl o-aminobenzoates;     -   physical sunscreens coated or not as titanium dioxide, zinc         oxide, iron oxides, mica, MnO, Fe₂O₃, Ce₂O₃, Al₂O₃, ZrO₂.         (surface coatings: polymethylmethacrylate, methicone         (methylhydrogenpolysiloxane CAS 9004-73-3), dimethicone,         isopropyl titanium triisostearate (CAS 61417-49-0), metal soaps         as magnesium stearate (CAS 4086-70-8), perfluoroalcohol         phosphate as C9-15 fluoroalcohol phosphate (CAS 74499-44-8; JP         5-86984, JP 4-330007)). The primary particle size is an average         of 15 nm-35 nm and the particle size In dispersion is in the         range of 100 nm-300 nm.     -   aminohydroxy-benzophenone derivatives disclosed in DE 10011317,         EP 1133980 and EP 1046391     -   phenyl-benzimidazole derivatives as disclosed in EP 1167358

The UV absorbers described in “Sunscreens”, Eds. N. J. Lowe, N. A. Shaath, Marcel Dekker, Inc., New York and Basle or in Cosmetics & Toiletries (107), 50ff (1992) also can be used as additional UV protective substances.

Synergistic effects are observed when UV absorbers are used in combination with antioxidants. Examples of antioxidants that can be used are listened in WO 01/36396 (pages 11-18), U.S. Pat. No. 5,922,310 and U.S. Pat. No. 4,786,493.

Further preferred UV absorbers used in addition to the uncharged and cationic benzotriazole UV absorbers in the formulations without limitation to those listed in the following are benzophenone-type substances such as benzophenone-1, benzophenone-2, benzophenone-3, benzophenone-4, benzophenone-5 (sodium salt) or benzotriazol-type substances such as benzenesulfonic acid, 3-(2H-benzotriazol-2-yl)-4-hydroxy-5-(1-methylpropyl)-, monosodium salt; 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methyl-phenol; 2-(2H-benzotriazol-2-yl)-6-dodecyl-4-methyl-phenol, branched and linear. Typical ingredients in the oil phase of emulsions (water in oil, oil in water or triple emulsion) or used in hair oils can be chosen from the following substance groups without limiting the kind of lipophilic ingredients to those substances:

Suitable cosmetic preparations may contain usually from 0.05 to 40% by weight, preferably from 0.1 to 20% by weight, based on the total weight of the composition, of one or more UV absorbers.

Preferred are the cosmetic preparations contain at least one triazine derivative UV absorber, for example, from 0.1 to 40% by weight, preferably from 0.1 to 20% by weight and especially from 0.5 to 10% by weight, based on the total weight of the composition, and the cosmetic preparations contain at least one cationic benzotriazole from 0.05-20% by weight, preferred from 0.1-20% by weight, based on the total weight of the composition. Typical cosmetic formulations containing uncharged and/or cationic benzotriazoles and/or antioxidants alone or in combinations are rinse-off products (e.g. shampoos, hair rinses, conditioners etc.),

Suitable cosmetic formulations are:

-   -   cosmetic hair-treatment preparations, e.g. hair-washing         preparations in the form of shampoos and conditioners, hair-care         preparations, e.g. pre-treatment preparations or leave-on         products such as sprays, creams, gels, lotions, mousses and         oils, or     -   hair tonics, styling creams, styling gels, pomades, hair rinses,         treatment packs, intensive hair treatments, hair-structuring         preparations, e.g. hair-waving preparations for permanent waves         (hot wave, mild wave, cold wave), hair-straightening         preparations, liquid hair-setting preparations, hair foams,         hairsprays, bleaching preparations, e.g. hydrogen peroxide         solutions, lightening shampoos, bleaching creams, bleaching         powders, bleaching pastes or oils, temporary, semi-permanent or         permanent hair colourants, preparations containing         self-oxidising dyes, or natural hair colourants, such as henna         or camomile.

The final formulations listed may exist in a wide variety of presentation forms, for example:

-   -   in the form of liquid preparations as a W/O, O/W, O/W/O, W/O/W         or PIT emulsion and all kinds of microemulsions,     -   in the form of a gel,     -   in the form of an oil, a cream, milk or lotion,     -   in the form of a powder, a lacquer, a tablet or make-up,     -   in the form of a stick,     -   in the form of a spray (spray with propellant gas or pump-action         spray) or an aerosol,     -   in the form of a foam, or     -   in the form of a paste.

Of special importance as cosmetic preparations for the hair are the above-mentioned preparations for hair treatment, especially hair-washing preparations in the form of shampoos, hair conditioners, hair-care preparations, e.g. pre-treatment preparations, hair tonics, styling creams, styling gels, pomades, hair rinses, treatment packs, intensive hair treatments, hair-straightening preparations, liquid hair-setting preparations, hair foams and hairsprays. Of special interest are hair-washing preparations in the form of shampoos.

A shampoo has, for example, the following composition: from 0.01 to 5% by weight of a UV absorber according to the invention, 12.0% by weight of sodium laureth-2-sulfate, 4.0% by weight of cocoamidopropyl betaine, 3.0% by weight of sodium chloride, and water ad 100%.

A further embodiment of the present invention concerns micronised UV absorbers, for example:

-   -   wet-grinding with a hard grinding medium, for example zirconium         silicate and a protective surfactant or a protective polymer in         water or In a suitable organic solvent;     -   spray-drying from a suitable solvent, for example aqueous         suspensions or suspensions containing organic solvents, or true         solutions in water, ethanol, dichloroethane, toluene or         N-methylpyrrolidone etc.;     -   by the expansion according to the RESS process (Rapid Expansion         of Supercritical Solutions) of supercritical fluids (e.g. CO₂)         in which the UV filter or filters is/are dissolved, or the         expansion of fluid carbon dioxide together with a solution of         one or more UV filters in a suitable organic solvent;     -   by reprecipitation from suitable solvents, including         supercritical fluids (GASR process=Gas Anti-Solvent         Recrystallisation/PCA process=Precipitation with Compressed         Anti-solvents).

As grinding apparatus for the preparation of the micronised organic UV absorbers there may be used, for example, a jet mill, ball mill, vibratory mill or hammer mill, preferably a high-speed mixing mill. The grinding is preferably carried out with a grinding aid, for example an alkylated vinylpyrrolidone polymer, a vinylpyrrolidone/vinyl acetate copolymer, an acyl glutamate, an alkyl polyglucoside, ceteareth-25 or a phospholipid.

The micronised UV absorbers so obtained usually have an average particle size that is from 0.02 to 2 μm, preferably from 0.05 to 1.5 μm, and more especially from 0.1 to 1.0 μm.

The UV absorbers can also be used dry in powder form. For that purpose the UV absorbers are subjected to known grinding methods, such as vacuum atomization, countercurrent spray-drying etc. Such powders have a particle size of from 0.1 μm to 2 μm. To avoid the occurrence of agglomeration, the UV absorbers can be coated with a surface-active compound prior to the pulverisation process, for example with an anionic, non-ionic or amphoteric surfactant, e.g. a phospholipid or a known polymer, such as PVP, or an acrylate. The colouring compositions according to the invention may further comprise antimicrobial agents.

Preferred antimicrobial preservatives and antimicrobial actives used in formulations (in most cases the INCI name of the antimicrobial substances is mentioned): formaldehyde and paraformaldehyde, hydroxy biphenyls and its salts such as ortho-phenylphenol, zinc pyrithion, chlorobutanol, hydroxy benzoic acids and their salts and esters such as methyl paraben, ethyl paraben, propyl paraben, butyl paraben, dibromo hexamidine and its salts including isothionate(4,4′-hexamethylenedioxy-bis(3-bromo-benzamidine) and 4,4′-hexamethylenedioxy-bis(3-bromo-benzamidinium 2-hydroxyethanesulfonate), mercury, (aceto-O)phenyl (especially phenyl mercuric acetate) and Mercurate(2-),(orthoborate(3-)-O)phenyl, dihydrogene (especially phenyl mercuric borate), 1,3-bis(2-ethylhexyl)-hexahydro-5-methyl-5-pyrimidine (Hexetidin), 5-bromo-5-nitro-1,3-dioxan, 2-bromo-2-nitro-1,3-propandiol, 2,4-dichlorobenzyl alcohol, 3,4,4′ trichlorocarbanilide (Trichlorcarban), p-chloro-m-cresol, 2,4,4′-trichloro 2-hydroxy diphenylether(triclosan), 4,4′-dichloro 2-hydroxy diphenylether, 4-chloro-3,5-dimethylphenol (Chloroxylenol), imidazolidinyl urea, poly-(hexamethylene biguanide) hydrochloride, 2-phenoxy ethanol(phenoxyethanol), hexamethylene tetramine (Methenamine), 1-(3-chloroallyl)-3,5,7-triaza-1-azonia-adamantanchloride (Quaternium 15),1-(4-chlorophenyoxy)-1-(1-imidazolyl)3,3-dimethyl-2-butanone (Climbazole), 1,3-bis(hydroxymethyl)-5,5-dimethyl-2,4-imidazolidinedione (DMDM hydantoin), benzyl alcohol, 1,2-dibromo-2,4-dicyano butane, 2,2′ methylene-bis(6-bromo-4-chloro phenol)(bromochlorophene), methylchloroisothiazolone, methylisothiazolone, octylisothiazolone, benzylisothiazolone, 2-benzyl-4-chlorophenol (Chlorophenone), chloracetamide, chlorhexidine, chlorhexidine acetate, chlorhexidine gluconate, chlorhexidine hydrochloride, 1-phenoxy-propane-2-ol(phenoxyisopropanol), 4,4-dimethyl-1,3-oxazolidine(dimethyl oxazolidine), diazolidinyl urea, 4,4′-hexamethylenedioxybisbenzamidine and 4,4′-hexamethylenedioxybis(benzamidinium-2-hydroxyethanesulfonate), glutaraldehyde(1,5-pentanedial), 7-ethylbicyclooxazolidine, 3-(4-chlorophenoxy)-1,2-propandiol(chlorophenesin), phenylmethoxymethanol and ((phenylmethoxy)methoxy)-methanol(benzylhemiformal), N-alkyl(C12-C22)trimethyl ammoniumbromide and -chloride(cetrimonium bromide, cetrimonium chloride), benzyl-dimethyl-(4-(2-(4-(1,1,3,3-tetramethylbutyl)-phenoxy)-ethoxy)-ethyl)-ammoniumchloride(benzethonium chloride), Alkyl-(C8-C18)-dimethyl-benzylammonium chloride, -bromide and saccharinate(benzalkonium chloride, benzalkonium bromide, benzalkonium saccharinate), benzoic acid and its salts and esters, propionic acid and its salts, salicylic acid and its salt, sorbic acid and its salts, sodium iodiate, inorganic sulfites and bisulfites such as sodium sulfite, dehydroacetic acid, formic acid, mercurate(1-ethyl)2-mercaptobenzoate(2-)-O,S-,hydrogene (Thiomersal or Thiomerosal), 10-undecylenic acid and its salts, octopirox(piroctone olamine), sodium hydroxy methyl-aminoacetate(sodium hydroxymethylglycinate), 3-iodo-2-propynyl butylcarbarnate, 10-undecylenic acid, sulfur.

Combinations with natural antimicrobials or chemically modified natural substances with antimicrobial activities such as chitosans and chitosan derivatives, farnesol, plant extracts such as clove oil, blue cypres oil etc. can be also used.

For use on human hair, the dyeing compositions can usually be incorporated into an aqueous cosmetic carrier. Suitable aqueous cosmetic carriers include, for example, creams, sprays, emulsions, gels, powders and also surfactant-containing foaming solutions, e.g. shampoos or other preparations, that are suitable for use on keratin-containing fibers. Such forms of use are described in detail in Research Disclosure 42448 (August 1999). If necessary, it is also possible to incorporate the dyeing compositions into anhydrous carriers, as described, for example, in U.S. Pat. No. 3,369,970, especially column 1, line 70 to column 3, line 55. The dyeing compositions according to the invention are also excellently suitable for the colouring method described in DE-A-3 829 870 using a colouring comb or a colouring brush.

Further carriers for dying compositions are for example described in “Dermatology”, edited by Ch. Culnan, H. Maibach, Verlag Marcel Dekker Inc., New York, Basle, 1986, Vol. 7, Ch. Zviak, The Science of Hair Care, chapter 7, pages 248-250, especially on page 243, line 1 to page 244, line 12.

Suitable formulations of cationic dyes, which can be used in the colouring compositions according to the invention, are described for example in

-   -   in WO 95/01772, especially on page 11, line 29 to page 12, line         7, or     -   in WO 01/66646, especially on page 7, line 1 to page 22, and         preferred from page 16, line 20 to page 22, or     -   direct dyes as described in DE-A-19 713 698, especially page 3,         line 51 to page 4, -line 29 and page 4, line 65 to page 5, line         60, or     -   direct dyes and oxidizing agent as described in WO 97/20545,         especially on page 9, line 1 to page 11, line 4, in particular         on page 11, line 6 to page 13, line 19.

Preferred formulations of cationic dyes with other dyes, which can be used in the colouring compositions according to the invention, are:

-   -   combinations of Pyrazolo-[1,5-a]-pyrimidines with at least one         cationic dye as described in EP 998,908, especially on page 47,         line 3 to page 49, line 26, and preferred on page 51, line 4 to         page 52, line 5, or     -   combinations of cationic dyes as described in FR-2788432,         especially on page 53, line 1 to page 63, line 23, especially a         combination of cationic dyes with Arianors in FR-2788432,         especially on pages 51 to 52, or especially a combination with         at least one Basic Brown 17, Basic brown 16, Basic Red 76 and         Basic Red 118, and/or at least one Basic Yellow 57, and/or at         least one Basic Blue 99, or     -   combinations of direct dyes and/or an oxidation dye and         oxidizing agents in the form of permanent-wave fixing solution,         especially with direct dyes as described in DE-A-1 9 713 698,         especially page 4, line 65 to page 35, line 59, or     -   combinations of cationic dyes and an oxidation dye of the         developer compound type and oxidizing agents as described in EP         850 638, especially on page 2, lines 3 to 12 and line 30 to page         14, and page 28, line 35 to page 30, line 20, preferred on page         30, line 25 to page 32, line 30, or     -   ready-to-use dyeing compositions and multicompartment device for         dyeing keratin fibers comprising combinations of an         extemporaneous mixture of a composition (A) containing one or         more oxidation dye precursors and optionally one or more         couplers, and of a composition (B), in powder form, containing         one or more direct dye, preferably cationic, optionally         dispersed in an organic pulverulent excipient and/or a mineral         pulverulent excipient, and a composition (C) containing one or         more oxidizing agent as described in U.S. Pat. No. 6,190,421,         especially in column 2, line 20 to line 31 in column 7, line 15         to column 8, line 43, and preferably in column 8, line 55 to         column 9, line 56, and preferably with direct dyes as described         in column 5, line 30 to column 7, line 14, or     -   a ready-to-use composition comprising, at least one oxidation         base, at least one cationic direct dye and at least one enzyme         of 2-electron oxidoreductase type in the presence of at least         one donor for the said enzyme as described in U.S. Pat. No.         6,228,129, especially in column 2, line 16 to column 25, line         55, and a multi-compartment dyeing device as described in column         26, lines 13 to 24, especially in column 26, line 26 to column         27, line 9, or     -   a ready-to-use composition comprising compositions of at least         one direct cationic dye and at least one nitrated benzene dye as         described in WO 99/20235 especially on page 1, line 25 to page         8, line 5, and on page 30, line 17 to page 34 line 25, with         cationic direct dyes as described on page 8, line 12 to page 25         line 6, and a multi-compartment dyeing device as described on         page 35, lines 21 to 27, especially on page 36, line 1 to page         37, or     -   a ready-to-use composition or a multi-compartment dyeing device         comprising compositions of at least one direct cationic dye and         at least one autooxidisable oxidation dye, especially benzene,         indol and indoline derivatives as described in WO 99/20234,         especially on page 26, line 5 to page 32, line 18, or     -   oxidation dyeing compositions of at least one direct dye and at         least one meta-Aminophenol derivative and at least one developer         compound and an oxidizing agent as described in EP 850 636,         especially on page 18, line 1 to page 22, line 11, or     -   oxidation dyeing compositions of at least one direct dye and at         least one developer compound selected from the group of         para-Phenylenediamine derivatives and Bis-Phenylalkylenediamine         and, and at least one coupler compound selected from the group         of meta-Diphenols and an oxidizing agent, as described in         EP-A-850 637, especially on page 19, line 24 to page 22, line         57,     -   cationic dye and e.g. a pyrazolo-(1,5-a)-pyrimidine derivatives,         as described in EP 998 908, especially on page 47, line 25 to         page 50, line 29, or     -   oxidative dye precursors (unsaturated aldehyde and coupler         compounds), as described in German Patent Application 197 172         24, especially on page 3, line 36 to page 9 line 64.

Cationic dyes, especially compound of formula (1), (2) or (3) may be present in the colouring compositions according to the invention preferably in an amount of from 0.001% to 5%, especially from 0.01% to 1%, based on the total dyeing composition.

The pH value of the ready-to-use dyeing preparations is usually from 2 to 11, preferably from 5to 10.

The constituents of the aqueous carrier are used in the colouring compositions to the invention in the amounts customary for that purpose; for example emulsifiers may be used in concentrations of from 0.5 to 30% by weight and thickeners in concentrations of from 0.1 to 25% by weight of the total dyeing composition.

If direct dyes, especially of compound of formula (1), (2) or (3) are used together with oxidation dyes and/or the addition salts thereof with an acid, they may be stored separately or together.

It is preferred to store the oxidation dyes and direct dyes, which are not stable to reduction, separately.

They may be stored in a liquid to paste-like preparation (aqueous or non-aqueous) or in the form of a dry powder.

When the dyes and adjuvants are stored together in a liquid preparation, the preparation should be substantially anhydrous in order to reduce reaction of the compounds. When they are stored separately, the reactive components are intimately mixed with one another only immediately before use. In the case of dry storage, before use a defined amount of hot (from 50 to 80° C.) water is usually added and a homogeneous mixture prepared.

One preferred method of applying direct dyes containing formulations on hair is by using a multi-compartment dyeing device or “kit” or any other multi-compartment packaging system, as described for example in WO 97/20545 on page 4, line 19 to line 27.

The colouring compositions according to the invention may combined with a suitable ready-to-use composition for the oxidation dyeing of keratin fibers, in particular human keratin, comprising an oxidizing agent, at least one direct dye, especially compound of formula (1), (2) or (3) and at least one oxidation dye precursor, as described in U.S. Pat. No. 6,190,421, in column 1, line 65 to column 3, line 65, especially in column 10, line 62 to column 12, line 65. Preferably, such a ready-to-use composition is prepared according to a first preferred embodiment by a process which comprises a preliminary step which involves separately storing, on the one hand, a composition (A) comprising, in a medium which is suitable for dyeing, at least one developer compound, especially selected from para-phenylenediamines and bis(phenyl)alkylenediamines, and the acid-addition salts thereof, at least one coupler, especially selected from meta-phenylenediamines and the acid-addition salts thereof, and at least one cationic direct dye, especially compound of formula (I), on the other hand, a composition (B) containing, in a medium which is suitable for dyeing, at least one oxidizing agent and mixing them together at the time of use before applying this mixture to the keratin fibers.

According to a second preferred embodiment for the preparation of the ready-to-use dye composition, the process includes a preliminary step which involves separately storing, on the one hand, a composition (A) comprising, in a medium which is suitable for dyeing, at least one developer compound, especially selected from para-phenylenediamines and bis(phenyl)alkylenediamines, and the acid-addition salts thereof, at least one coupler compound, especially selected from meta-phenylenediamines and the acid-addition salts thereof; on the other hand, a composition (A′) comprising, in a medium which is suitable for dyeing, at least one cationic direct dye, especially compound of formula (1), and, lastly, a composition (B) containing, in a medium which is suitable for dyeing, at least one oxidizing agent as defined above, and mixing them together at the time of use before applying this mixture to the keratin fibers.

The composition (A′) used according to this second variant of the process in accordance with the invention can optionally be in powder form, the cationic direct dye(s) in accordance with the invention itself (themselves) constituting, in this case, all of the said composition (A′) or optionally being dispersed in an organic and/or inorganic pulverulent excipient.

When it is present in the composition A′, the organic excipient can be of synthetic or plant origin and is selected in particular from crosslinked and non-crosslinked synthetic polymers, polysaccharides such as celluloses and modified or unmodified starches, as well as natural products containing them such as sawdust and plant gums (guar gum, carob gum, xanthan gum, etc.).

When it is present in the composition (A′), the inorganic excipient can contain metal oxides such as titanium oxides, aluminium oxides, kaolin, talc, silicates, mica and silicas.

An very suitable excipient in the colouring compositions according to the invention is sawdust.

The powdered composition (A′) can also contain binders or coating products in an amount, which preferably does not exceed approximately 3% by weight relative to the total weight of the said composition (A′).

These binders are preferably selected from oils and liquid fatty substances of inorganic, synthetic, animal or plant origin.

The composition (A′) may optionally also contain other adjuvants, in powdered form, In particular surfactants of any kind, hair conditioners such as, for example, cationic polymers, etc.

Another subject of the invention is a multi-compartment dyeing device or “kit” or any other multi-compartment packaging system, as described for example in U.S. Pat. No. 6,228,129, especially in column 26, lines 13 to 24, especially in column 26, line 26 to column 27, line 9, or. A first compartment which contains the composition (A) as defined above, an optional second compartment contains the composition (A′) as defined above, when it is present, and a third compartment contains the oxidizing composition (B) as defined above. These devices can be equipped with means which allow the desired mixture to be applied to the hair, such as the devices described in French patent FR-2,586,913, the disclosure of which is specifically incorporated by reference herein.

An oxidizing agent, which may be added to the colouring compositions according to the invention containing composition, comprises an oxidizing agent and a base.

Further, this composition comprises for this oxidizing agent containing composition customary adjuvant and additives.

The formulations are for example a solution, especially a thickened watery or watery alcoholic solution, a cream, foam, a gel, a powder or an emulsion.

In general, preference is given to a cream formulation, a gel formulation or a foam formulation, and especially a foam formulation.

But, if stability- or solubility-problems arise it may of advantage to use powder formulation as for example described in DE 197 13 698, page 2, line 26 to 54 and page 3, line 51 to page 4, line 25, and page 4, line 41 to page 5 line 59.

The oxidizing agent (calculated as hydrogen peroxide) is present in this composition in 0.5 to 12% by weight, in particular from 1 to 6% by weight based on the totals weight of the oxidizing agent containing composition.

The pH-value of the oxidizing agent containing composition is usually about 2 to 7, and in particular about 3 to 6.

An oxidizing agent free composition, which may be added to the colouring compositions according to the invention, comprises a developer compound and a coupler compound and a reduction agent, or

-   -   a developer compound or/and optionally a reduction agent, or     -   a coupler compound and a reduction agent.

Further, an oxidizing agent free composition may additionally comprise a direct dye as for example described in German Patent Application 199 59 479, column 3, line 12 to line 16.

Additionally, the oxidizing agent free composition usually comprises customary adjuvant and additives. Preferred are those, which are described in German Patent Application, in column 3, line 17 to line 41.

The pH-value of the oxidizing agent free composition is usually about 3 to 11, and in particular about 5 to 10, and most particular about 9 to 10.

For adjusting the pH-value organic or inorganic acids, as for example described in German Patent Application 199 59 479, column 3, line 46 to line 53 are suitable.

The colouring compositions according to the invention may also be combined with hair dye compositions comprising an acid dye. Hair dye compositions comprising an acid dye are known. For example, they are described in “Dermatology”, edited by Ch. Culnan, H. Maibach, Verlag Marcel Dekker Inc., New York, Basle, 1986, Vol. 7, Ch. Zviak, The Science of Hair Care, chapter 7, pages 248-250, especially on page 253 and 254.

The hair dye compositions comprising an acid dye have a pH of 2-6, preferably 2-5, more preferably 2.5-4.0. If the pH is too low, the resulting composition may roughen the hair, scalp and hand skin due to an acid component in some cases. If the pH is too high, the penetration accelerating effect on the acid dye is lowered.

A compound of formula (1), (2) or (3) according to the present invention may also readily be used in combination with other dyes and/or adjuvants used in the colouring of hair, for example

-   -   acid dye and an alkylene carbonate, as described in U.S. Pat.         No. 6,248,314, especially in examples 1 and 2, or     -   acid hair dye compositions comprise various kinds of organic         solvents represented by benzyl alcohol as a penetrant solvent         have good penetrability into hair, as described in Japanese         Patent Application Laid-Open Nos. 210023/1986 and 101841/1995,         or     -   acid hair dye compositions with a water-soluble polymer or the         like to prevent the drooping of the hair dye composition, as         described for example in Japanese Patent Application Laid-Open         Nos. 87450/1998, 255540/1997 and 245348/1996, or     -   acid hair dye compositions with a water-soluble polymer of         aromatic alcohols, lower alkylene carbonates, or the like as         described in Japanese Patent Application Laid-Open No.         53970/1998 and Japanese Patent Invention No. 23911/1973.

Preferred keratin fibers are human hair.

The dyes or dye precursors are suitable for all-over colouring of the hair, that is to say when colouring the hair on a first occasion, and also for re-colouring subsequently, or colouration of locks or parts of the hair.

The dyes or dye precursors are applied to hair for example through massage in by hand, a comb, a brush, or a bottle, or a bottle, which is combined with a comb or a nozzle.

In general, the dyes or dye precursors are applied to the hair in a formulation with further components, like adjuvants or additional dyes or dye precursors.

After the application of the dyeing composition the dyed hair is customary rinsed. Customary, the rinsing is conducted with water.

In a suitable embodiment of the processes of the present invention for dyeing human hair, the dyeing composition is not rinsed off, but washed off with a commercially available hair shampoo.

In general, the dyed hair is dried after rinsing and/or washing.

Customary, drying is conducted with hot air by means of a drier or the like, since color migration to clothes and the like becomes scarcely caused.

A very suitable process for dyeing keratin fibers comprises contacting the keratin fibers under alkaline conditions with at least one capped diazotized compound and a coupler compound, with the proviso that the pH is adjusted in the range from 2 to 6 in the last process step.

Adjusting the pH is achieved in conventional manner by adding an acid as described for example in EP 962218, especially on page 3, lines 12 to 16.

Acids are for example tartaric acid or citric acid, a citric acid gel, a suitable buffer solution with optionally an acid dye.

Preferred technical forms of acids are a solution, a gel, a cream, foam, a conditioner, a emulsion, a shampoo and more preferred a shampoo or a conditioner.

In the context of the present invention, the expression “alkaline condition”, denotes to all process steps without those wherein acid conditions are explicitly described.

In the processes for colouring according to the invention, whether or not colouring is to be carried out in the presence of a further dye will depend upon the colour shade to be obtained.

In the context of the present invention, the expression “a further dye”, denotes preferably an oxidation dye, a diazotised compound, a capped diazotised compound and/or coupler compound, or acid dye, especially selected a cationic, anionic or uncharged direct dye, especially a cationic dye selected from the group of the cationic dyes as described in WO 95/01772, especially on page 2, line 7 to page 4, line 1, and preferred on page 4, line 35 to page 8, line 21 with the given preferences, and as described in WO 01/66646, especially on page 1, line 18 to page 3, line 16, or a mixture of at least two cationic dyes as described in WO 95/01772, especially on page 8, line 34 to page 10, line 22.

The processes of the present invention for dyeing keratin fibers, in particular human hair, comprise after contacting the keratin fiber with at least a compound of formula (1), (2) or (3), and then

-   -   leaving the fibers to stand, and     -   then rinsing the fibers.

The process for dyeing is for example described in WO 01/66646 on page 15, line 32 to page 16, line 2.

Usually, the dyeing compositions are usually applied to the hair in an amount of from 50 to 100 g.

This composition is left on the fiber at 15 to 45° C. for 5 to 30 minutes, and in particular for 10 to 20 minutes at 20 to 30° C.

Further preferred does a process for dyeing keratin fibres comprise contacting the keratin fibers with at least one direct dye, a base and an oxidizing agent.

Compositions comprising at least one direct dye, especially compound of formula (1), (2) or (3) and an oxidizing agent, are for example described in WO 97/20545, on page 3, line 24 to page 11, line 4, and especially on page 4, line 9 to 17.

The composition comprising at least one direct dye, especially at least a compound of formula (1), (2) or (3), a base and an oxidizing agent is prepared by mixing at least one direct dye and a base, and then just before the dyeing of the hair, adding an oxidizing agent.

Alternatively, the oxidizing agent can be applied simultaneously with a composition comprising at least one dye, such as a compound of formula (1), (2) or (3) and a base.

Preferably, the process for dyeing keratin fibres with at least on direct dye comprises using a multi-compartment dyeing device or ‘kits’ as described for example in WO 97/20545, especially on page 4, line 19 to line 27.

Suitable processes for enlightening dyeing, wherein a compound of formula (1), (2) or (3) according to the invention can be used in combination with an oxidative agent are described in WO 97/20545, on page 11 to page 13.

Further preferred are processes for dyeing keratine fibers, especially compound of formula (1), (2) or (3) with further cationic dyes, according to processes as described

-   -   in WO 95/01772, especially on page 10, line 24 to page 11, line         16, and especially on page 11, line 29 to page 28, or     -   in WO 01/66646, especially on page 1, line 18 to page 3, line         16, and preferred from page 16, line 20 to page 22, or     -   in EP 970 685, especially on page 50, lines 15 to 43, and         preferred from page 50, line 46 to page 51, line 40, or     -   in DE-A-19 713 698, especially page 5, lines 26 to 60, or     -   a process of dyeing with direct dyes and oxidizing agent is         described in WO 97/20545, especially on page 10, line 10 to page         11, line 55 and preferably on page 11, line 6 to page 13, line         19.

Further preferred are processes for dyeing keratine fibers, especially compound of formula (1), (2) or (3) with other dyes, which can be combined with a compound of formula (1), (2) or (3) according to the present invention, are:

-   -   mixtures of at least two cationic dyes as described in WO         95/01772, especially on page 11, lines 1 to 15, or     -   combinations of Pyrazolo-[1,5-a]-pyrimidines with at least one         cationic dye as described in EP 998,908, especially on page 50,         lines 15 to 28, or     -   combinations of cationic dyes as described in FR-2788432,         especially on page 49, line 28 to page 52, and preferred on page         50, lines 16 to 28, or     -   combinations of direct dyes and/or an oxidation dye and         oxidizing agents in the form of permanent-wave fixing solution,         especially with direct dyes as described in DE-A-19 713 698,         especially on page 2, lines 12 to 23, especially on page 4, line         65 to page 5, line 59, or     -   combinations of cationic dyes and an oxidation dye of the         developer compound type and oxidizing agents as described in EP         850 638, especially on page 29, line 42 to page 30, line 20 and         preferred on page 30, line 25 to page 32, line 30, or     -   combinations of an extemporaneous mixture of a composition (A)         containing one or more oxidation dye precursors and optionally         one or more couplers, and of a composition (B), in powder form,         containing one or more direct dye, preferably cationic,         optionally dispersed in an organic pulverulent excipient and/or         a mineral pulverulent excipient, and a composition (C)         containing one or more oxidizing agent as described in U.S. Pat.         No. 6,190,421, especially in column 8, lines 43 to 52, and         preferably in column 8, line 55 to column 9, line 55, or     -   a ready-to-use composition comprising, at least one oxidation         base, at least one cationic direct dye and at least one enzyme         of 2-electron oxidoreductase type in the presence of at least         one donor for the said enzyme as described in U.S. Pat. No.         6,228,129, especially in column 25, line 56 to column 27, line         9, or     -   a ready-to-use composition or multi-compartment dyeing device         comprising compositions of at least one direct cationic dye and         at least one nitrated benzene dye as described in WO 99/20235 on         page 34, line 27 to page 37, or     -   a ready-to-use composition or multi-compartment dyeing device         comprising compositions of at least one direct cationic dye and         at least one autooxidisable oxidation dye, especially benzene,         indol and indoline derivatives as described in WO 99/20234,         especially on page 32, line 20 to page 35, oxidation dyeing         compositions of at least one direct dye and at least one         meta-Aminophenol derivative and at least one developer compound         and an oxidizing agent as described in EP 850636, especially on         page 18, line 1 to page 22, line 11, or     -   oxidation dyeing compositions of at least one direct dye and at         least one developer compound selected from the group of         para-Phenylenediamine derivatives and Bis-Phenylalkylenediamine         and, and at least one coupler compound selected from the group         of meta-Diphenols and an oxidizing agent, as described in         EP-A-850 637, especially on page 19, line 24 to page 22, line         57,     -   cationic dye and e.g. a pyrazolo-(1,5-a)-pyrimidine derivatives,         as described in EP 998908, especially on page 47, line 25 to         page 50, line 29, or     -   arianors and/or oxidative dyes, as described in FR-2 788 432,         especially on page 2, line 16 to page 3, line 16, and page 5,         line 19 to page 14, line 8, and combinations with cationic dyes         as described on page 14, line 23 and following, or     -   oxidative dye precursors (unsaturated aldehyde and coupler         compounds), as described in German Patent Application 197 172         24, especially on page 3, line 36 to page 9 line 64.

The processes of colouring of keratin fibers, especially human hair, with a compound of formula (1), (2) or (3) according to the present invention may be combined with other direct dyes and oxidative dyes.

In a preferred embodiment of the present invention the process for dyeing keratin fibers with direct dyes and oxidative dyes, in particular human hair, comprises

-   -   a) contacting the keratin fibers with an oxidizing agent,         optionally containing at least a compound of formula (1), (2) or         (3),     -   b) then contacting the keratin fibers with an oxidizing agent         free composition, optionally containing at least a compound of         formula (1), (2) or (3),     -   or     -   a) contacting the keratin fibers with an oxidizing agent free         composition, optionally containing at least a compound of         formula (1), (2) or (3),     -   b) then contacting the keratin fibers with an oxidizing agent,         optionally containing least a compound of formula (1), (2) or         (3), with the proviso that at least in one of the process         steps a) or b) a compound of formula (1), (2) or (3) is present.

The process of colouring with a compound of formula (1), (2) or (3) according to the present invention may combined with a process for dyeing keratin fibers with direct dyes and oxidative dyes, which comprises

-   -   contacting the keratin fibers with least a compound of formula         (1), (2) or (3),     -   then contacting the keratin fibers with an oxidizing agent free         composition.

Such process is for example described in DE 199 41 450, especially on page 5, lines 50 to 58, and on page 8, line 31 to 46.

Oxidizing agent is usually applied in form of an oxidizing agent containing composition. Oxidizing agent free composition containing at least one coupler compound, at least one developer compound, a base and a reduction agent.

Customary, the oxidizing agent containing composition is evenly applied in a sufficient amount related to the amount of hair, usually with 30 to 200 g.

In general, the oxidizing agent containing composition is left on the fiber at 15 to 45° C. for 0 to 15 minutes, and in particular for 0 to 5 minutes.

Then the oxidizing agent free composition is applied to the hair.

In general, the direct dye and oxidizing agent free composition is left on the fiber at 15 to 50° C. for 5 to 45 minutes, and in particular for 10 to 25 minutes.

The coupler and developer compounds of the oxidizing agent free composition can be applied simultaneously or in succession. Preferred is a simultaneous application.

One preferred embodiment of the process is to wash the hair with shampoo and or a weak acid, such as citric acid or tartrate acid.

The direct dyes, which are stable to reduction can stored together with the oxidizing agent free compositions and are applicable as composition.

It is of advantage to prepare compositions of direct dyes, which are not stable to reduction, with oxidizing agent free compositions just before the dyeing process.

Further, a direct dye and an oxidizing agent free composition can be applied simultaneously or in succession.

A further process for the coloration of keratin fiber with direct dyes and oxidation dyes, which can be used in combination with a compound of formula (1), (2) or (3) according to the invention, comprises

-   -   mixing at least a compound of formula (1), (2) or (3) and         optionally at least one coupler compound and at least one         developer compound, and an oxidizing agent, which optionally         contains at least one further direct dye, and     -   then contacting the keratin fibers with the mixture as prepared         in step a).

A further suitable process for the coloration of keratin fiber with direct dyes and oxidation dyes, which can be used in combination with a compound of formula (1), (2) or (3) according to the invention, comprises

-   -   mixing at least one autooxidable compound and at least one         developer compound and at least one compound of formula (1), (2)         or (3), and     -   then contacting the keratin fibers with the mixture prepared in         step a).

The present invention relates also to a process, in which a dye of formula (1), (2) or (3), or cationic dye of formula (1), (2) or (3) prepared according to a process according to the invention, or a composition according to the invention,

-   -   and,     -   in succession in any desired order, or simultaneously,     -   a capped diazonium compound and     -   a water-soluble coupling component,     -   are applied to the material to be dyed under conditions in which         coupling does not take place initially, and then the capped         diazonium compound disposed on the material is caused to react         with the coupling component.

The first step of the dyeing method according to the invention comprises applying to the material to be dyed, in succession in any order or simultaneously, a capped diazonium compound and a water-soluble coupling component and, optionally, a cationic direct dye, the application being carried out under such conditions that coupling does not take place initially. This is effected, for example, by immersing the material in a solution comprising the capped diazonium compound or the coupling component and, optionally, a cationic direct dye, and then, if desired after rinsing and intermediate drying, immersing the material in a solution of the second component. Preferably, however, the capped diazonium compound and the coupling component and, optionally, a cationic direct dye, are present together in one solution. Such solutions can also be applied to the material by spraying or by similar measures, care having to be taken that penetration is adequate unless it is desired to dye only the upper layers. In that first step, the diazonium compound and the coupling component should not yet react with each other, and that is preferably achieved by maintaining a pH value of from 8 to 12, preferably from 9 to 11.

In the second step, the diazonium compound and the coupling component are then caused to react, preferably by lowering the pH to a value of from 5 to 2, especially from 3 to 4. The pH value is lowered in customary manner by addition of an acid or a suitable buffer solution, especially citric acid or citric acid gel. If desired, a cationic direct dye may be used in the second step. In any event, it is necessary for a cationic direct dye to be used in one of steps 1 and 2 of the process according to the invention.

The dyed material is then finished in conventional manner, for example by rinsing with water and subsequently drying.

Further, in the present invention especially preferred is a process for dyeing keratin fibers, in particular human hair, with capped diazotised compounds, which comprises, contacting the keratin fibers, under alkaline conditions, with at least one capped diazotised compound and a coupler compound, and optionally an oxidising agent, and optionally in the presence of a further dye, and optionally with at least a compound of formula (1), (2) or (3), then adjusting the pH in the range of 6 to 2 by treatment with acid, optionally in the presence of a further dye, especially with, and optionally at least a compound of formula (1), (2) or (3), with the proviso that at least in one step d) or e) at least a compound of formula (1), (2) or (3) is present.

The capped diazotised compound and coupler compound and optionally the oxidizing agent, can be applied in any desired order successively, or simultaneously.

Preferably, however, the capped diazotised compound and the coupler compound are applied simultaneously, in a single composition.

Customary the dyeing composition is applied to the hair in an amount of from 50 to 100 g.

In the context of the present invention, the expression “alkaline conditions” denotes a pH in the range from 8 to 10, preferably 9-10, especially 9.5-10.

Adding bases, for example sodium carbonate, ammonia or sodium hydroxide, to the hair or to the dye precursors, the capped diazotised compound and/or the water-soluble coupling component, or to colouring compositions comprising the dye precursors, customarily achieve the alkaline conditions.

In the second stage, the diazotised compound and the coupler compound are then caused to react, preferably by lowering the pH by adding an acid to a value of from 6 to 2, especially from 3 to 4.

Acids are for example tartaric acid or citric acid, a citric acid gel, a suitable buffer solution with optionally an acid dye.

Preferred technical forms of acids are a solution, a gel, a cream, foam, a conditioner, a emulsion, a shampoo and more preferred a shampoo or a conditioner.

The ratio of the amount of alkaline colouring composition applied In the first stage to that of acid colouring composition applied in the second stage is preferably about from 1:3 to 3:1, especially about 1:1.

This first alkaline and then acid dyeing compositions each are left on the fiber at 15 to 45° C. for 5 to 60 minutes, and in particular for 5 to 45 minutes at 20 to 30° C.

A preferred embodiment of the process for dyeing keratin fibres with capped diazotised compounds and a coupler compound, comprises contacting the keratin fibres with more than one capped diazotised compound and/or more than one coupler compound.

Preferred is a process of the present Invention for the coloration of keratin fiber with capped diazotised compounds and at least a compound of formula (1), (2) or (3), comprises mixing, under alkaline conditions, at least one with capped diazotised compound and at least one coupler compound and, optionally with at least a compound of formula (I),

-   -   and optionally at least one developer compound; and an oxidizing         agent, and, optionally with at least a compound of formula         (1), (2) or (3), and     -   then contacting the keratin fibers with the mixture as prepared         in step a), and     -   then adjusting the pH in the range of 6 to 2 by treatment with         acid, optionally in the presence of a further dye,     -   with the proviso that at least in one of the process a compound         of formula (1), (2) or (3) is present.

More preferred is a process for dyeing keratin fibres with at least one capped diazotized compound, which comprises

-   -   mixing under alkaline conditions, at least one capped diazotized         compound and at least a compound of formula (1), (2) or (3), a         base and an oxidizing agent, and     -   then contacting the keratin fibers with the mixture as prepared         in step a),     -   then adjusting the pH in the range of 6 to 2 by treatment with         acid, optionally in the presence of a further dye.

Further, preferred is a process for the coloration of keratin fiber with capped diazotised compounds comprising

-   -   mixing under alkaline conditions, at least one with capped         diazotised compound and at least one coupler compound and         optionally at least a compound of formula (1), (2) or (3), and         optionally at least one developer compound, and optionally at         least one autooxidable compound, and     -   then contacting the keratin fibers with the mixture prepared in         step a),     -   then adjusting the pH in the range of 6 to 2 by treatment with         acid, and and optionally at least a compound of formula (1), (2)         or (3), and optionally in the presence of a further dye, with         the proviso that at least in one of the process a compound of         formula (1), (2) or (3) is present.

A further preferred process for the two-step direct dyeing of keratin fibres, which can be used in combination with a compound of formula (1), (2) or (3) according to the invention, is characterized in that,

-   -   contacting the keratin fibers with an oxidizing agent or an         oxidizing agent containing composition,     -   then contacting the keratin fibers with at least one capped         diazotised compound and at least a coupler compound and a         compound of formula (1), (2) or (3), and optionally an oxidizing         agent free composition,     -   then adjusting the pH in the range of 6 to 2 by treatment with         acid, optionally in the presence of a further dye.     -   or     -   contacting the keratin fibers with at least one capped         diazotised compound and a coupler compound and a compound of         formula (1), (2) or (3), and optionally an oxidizing agent free         composition,     -   then contacting the keratin fibers with an oxidizing agent or an         oxidizing agent containing composition,     -   then adjusting the pH in the range of 5 to 2 by treatment with         acid, optionally in the presence of a further dye.

The present invention also concerns a process for the colouration of keratin fibers, especially human hair, with acid dyes, which can be used in combination with a compound of formula (1), (2) or (3) according to the invention.

The process comprises

-   -   contacting the keratin fiber with an acid dye and at least a         compound of formula (1), (2) or (3).

Customary, the dyeing composition comprising an acid dye is applied to the hair in an amount of from 50 to 100 g.

This in a composition is left on the fiber at 15 to 45° C. for 1 to 30 minutes, and in particular for 0 to 15 minutes at 20 to 30° C.

Preferably the hair is rinsed and than washed with shampoo and more preferably not rinsed, but washed with shampoo.

The shampoo used herein includes a shampoo comprising 5-20% of a usual anionic surfactant such as an alkylsulfate or polyoxyethylene alkylsulfate.

Further, the present invention relates to a method of dyeing keratin-containing fibres with the cationic reactive dyes, which comprises treating the fibres with the cationic reactive dyes defined at the beginning or with the dye compositions according to the invention.

A preferred embodiment of the method according to the invention for dyeing keratin-containing fibres comprises treating the fibres with a dyeing solution, prepared according to the process of the invention, comprising a tinctorially effective amount of a cationic reactive dye of formula (1), (2) or (3).

The cationic reactive dyes defined at the beginning are present in the dye compositions according to the invention preferably in a tinctorially effective amount of from 0.001% to 5%, especially from 0.01% to 1%, based on the total dyestuff.

The keratin-containing fibres are usually treated with the dyeing solution for about 30 minutes at 20-25° C.

A further preferred embodiment of the present invention relates to a method of dyeing hair, which comprises treating the hair with

-   -   a) an acidic or alkaline permanent-wave solution, and     -   b) then with a dyeing solution, prepared according to the         process of the invention, comprising a cationic reactive dye of         formula (1), (2) or (3).

Usually the keratin-containing fibres are treated with the permanent-wave solution for about 3-10 minutes, preferably for 4-6 minutes, at 20-25° C.

It is generally advisable to rinse the hair after treatment with the dyeing solution and/or permanent-wave solution.

The present invention relates also to the use of the cationic reactive dyes defined at the beginning or of the dye compositions according to the invention for dyeing keratin fibers, wool, leather, silk, cellulose or polyamides, especially for dyeing hair.

A preferred embodiment of the process according to the invention for dyeing keratin-containing fibres comprises treating the fibres with a dyeing solution, prepared according to the process of the invention, comprising a tinctorially effective amount of a cationic reactive dye.

The cationic reactive dyes are present in the dye compositions according to the invention preferably in a tinctorially effective amount of from 0.001% to 5%, especially from 0.01% to 1%, based on the total dyestuff.

The keratin-containing fibres are usually treated with the dyeing solution for about 30 minutes at 20-25° C.

A further preferred embodiment of the present invention relates to a method of dyeing hair, which comprises treating the hair with

-   -   a) an acidic or alkaline permanent-wave solution, and     -   b) then with a dyeing solution, prepared according to the         process of the invention, comprising a cationic reactive dye.

Usually the keratin-containing fibres are treated with the permanent-wave solution for about 3-10 minutes, preferably for 4-6 minutes, at 20-25° C.

A preferred embodiment of the present invention relates to a method of dyeing hair, which comprises treating the hair with a mixture of

-   -   a) an acidic or alkaline permanent-wave solution comprising a         thiol derivative, and     -   b) a dyeing solution comprising a cationic dichlorotriazine         reactive dye or a cationic monofluoromonochloropyrimidine         reactive dye.

The dyes according to the invention are distinguished by brilliant shades. They are suitable for dyeing organic material, such as keratin, wool, leather, silk, cellulose or polyamides, especially keratin-containing fibres, cotton or nylon, and preferably human hair. The dyeings obtained are distinguished by their depth of shade and their good fastness to washing properties, such as, for example, fastness to light, shampooing and rubbing. The stability and storage stability of the dyes according to the invention are excellent. They are accordingly especially suitable for dyeing under oxidising and reducing conditions. The advantage of the new dyes according to the present invention is their stability against reduction agents e. g. sodium sulfite and ascorbic acid. Therefore you can combine them with oxidation dyes in one emulsion.

The following Examples serve to illustrate the processes for colouration without limiting the processes thereto. Unless specified otherwise, parts and percentages relate to weight. The amounts of dye specified are relative to the material being coloured.

EXAMPLES G Application

Compositions A, B, C, D, E, F and G for colouring human hair according to the following table below. D1- E6- G4- Compositions A B C D20** E20**** F* G13*** cetyl stearyl alcohol 11.00 11.00 11.00 11.00 11.00 11.00 oleth-5 5.0 5.0 5.0 5.0 5.0 5.0 oleic acid 2.5 2.5 2.5 2.5 2.5 2.5 stearic acid 2.5 2.5 2.5 2.5 2.5 2.5 monoethanolamide coconut fatty acid 2.5 2.5 2.5 2.5 2.5 2.5 monoethanolamide sodium lauryl sulfate 1.7 1.7 1.7 1.7 1.7 1.7 1,2-propanediol 1.0 1.0 1.0 1.0 1.0 1.0 ammonium chloride 0.5 0.5 0.5 0.5 0.5 0.5 EDTA, tetrasodium 0.2 0.2 0.2 0.2 0.2 0.2 salt perfume 0.4 0.4 0.4 0.4 0.4 0.4 wheat protein 0.2 0.2 0.2 0.2 0.22 0.2 hydrolysate silica 0.1 0.1 0.1 0.1 0.1 0.1 2,5-diaminotoluene 0.7 0.7 sulfate 4-amino-2- 0.5 0.5 hydroxytoluene 2,5,6-triamino-4- 0.2 0.2 hydroxypyrimidine sulfate sodium sulfite 1.0 1.0 ascorbic acid 0.5 0.5 triazene of Example 9.33 15a coupler of Example 12.03 15 Direct dye** 0.4 Direct dye*** 0.4 Direct dye**** 0.4 Black Color No. 401 0.1 Purple Color 401 0.05 Orange Color No. 0.1 205 benzyl alcohol 2.0 ethylene carbonate 10 propylene carbonate 15 ethanol 109 lactic acid 3.5 ssodium carbonate of solution pH 2.9 hydroxyethyl 1.5 cellulose ammonia (25%) 9.2 9.2 9.2 9.2 9.2 9.2 composition: pH 9.8 9.8 9.8 9.8 9.8 9.8 water ad 100 ad 100 ad 100 ad 100 ad 100 ad ad 100 100 *F: dye mixture known from U.S. Pat. No. 6,248,314 **D1-D10 comprise the following dyes: in D1 the direct dye** is Basic Yellow 87; in D2 the direct dye** is Basic Orange 31; in D3 the direct dye** is or Basic Red 51; in D4 the direct dye** is the cationic dye of example 4 as described in WO 01/66646; in D5 the direct dye** is the cationic dye of example 6, compound of formula 106, as described WO 02/31056; in D6 the direct dye** has the following formula (I) (I)

wherein R₁ is methyl, R₂ is benzyl, R₃ is hydrogen; in D7 the direct dye** is a compound of formula (I) wherein R₁ is benzyl, R₂ is benzyl, R₃ is hydrogen; in D8 the direct dye** is a compound of formula (I) wherein R₁ is benzyl, R₂ is methyl, R₃ iss hydrogen. In D10 the direct dye** is a cationic dye of formula (3) as described in EP-A-714,954. **D11-D20 and ***G4-G13 comprise the following direct dyes: in D11 the direct dye** and in G4 direct dye*** is a compound of formula (4), wherein X⁻ is acetate; in D12 the direct dye** and in G5 direct dye*** is a compound of formula (5), wherein X⁻ is formate; in D13 the direct dye** and in G6 direct dye*** is a compound of formula (6), wherein X⁻ is acetate; in D14 the direct dye** and in G7 direct dye*** is a compound of formula (7), wherein X⁻ is acetate; in D15 the direct dye** and in G8 direct dye*** is a compound of formula (8), wherein X⁻ is acetate; in D16 the direct dye** and in G9 direct dye*** is a compound of formula (9), wherein X⁻ is acetate; in D17 the direct dye** and in G10 direct dye*** is a compound of formula (10), wherein X⁻ is succinate; in D18 the direct dye** and in G11 direct dye*** is a compound of formula (11), wherein X⁻ is lactate; in D19 the direct dye** and in G12 direct dye*** is a compound of formula (12), wherein X⁻ is acrylate; in D20 the direct dye** and in G13 direct dye*** is a compound of formula (13), wherein X⁻ is acetate; ****E6-E20: In E6 the direct dye**** is identical the direct dye** of D6; in E7 the direct dye**** is identical the direct dye** of D7; in E8 the direct dye**** is identical the direct dye** of D8; E9 comprises as direct dye Basic Yellow 87. in E10 the direct dye**** is identical the direct dye** of D10; in E11 the direct dye**** is identical the direct dye** of D11; in E12 the direct dye**** is identical the direct dye** of D12; in E13 the direct dye**** is identical the direct dye** of D13; in E14 the direct dye**** is identical the direct dye** of D14; in E15 the direct dye**** is identical the direct dye** of D15; in E16 the direct dye**** is identical the direct dye** of D16; in E17 the direct dye**** is identical the direct dye** of D17; in E18 the direct dye**** is identical the direct dye** of D18; in E19 the direct dye**** is identical the direct dye** of D19. in E20 the direct dye**** is identical the direct dye** of D20.

Example G/3

A strand of middle blond undamaged human hair is coloured

-   -   3a) with a mixture of 20 g of 6% hydrogen peroxide solution and         a composition consisting of 5 g each of compositions A, B, C and         G5, and alternatively     -   3b) first with 20 g of 6% hydrogen peroxide solution and then         with 5 g of a composition A, 5 g of composition B, 5 g of         composition C and 5 g of composition G6, or     -   3c) first with 5 g of a composition A, 5 g of composition B, 5 g         of composition C and 5 g of composition G13, and then with 20 g         of 6% hydrogen peroxide solution.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. 10 g of a 2% strength aqueous citric acid gel are then applied to the strand. After contact for 5 minutes, the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example G/4

A strand of blond undamaged human hair is coloured

-   -   4a) with a composition consisting of 5 g each of compositions A,         B and G10, and     -   4b) alternatively the colouring mixture is allowed to act on the         hair for 30 minutes at about 22° C. 10 g of a 2% strength         aqueous citric acid gel are then applied to the strand. After         contact for 5 minutes, the strand is rinsed thoroughly,         shampooed and then dried.

A strong, intense, striking red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (4a/G9) is identical to Example 4a with the proviso that G10 is replaced by G9.

Example (4a/G13) is identical to Example 4a with the proviso that G10 is replaced by G13.

Example G/5

A strand of middle blond undamaged human hair is coloured

-   -   5a) with a mixture of 15 g of 6% hydrogen peroxide solution and         a composition consisting of 5 g each of compositions A, B and         G6, and alternatively     -   5b) first with 15 g of 6% hydrogen peroxide solution, and then         with 5 g of a composition A, 5 g of composition, and B and 5 g         of composition G6.     -   5c) first with 5 g of a composition A, 5 g of composition, and B         and 5 g of composition G6, and then with 15 g of 6% hydrogen         peroxide solution.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. 10 g of a 2% strength aqueous citric acid gel are then applied to the strand. After contact for 5 minutes, the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (5a/G5) is identical to Example 5a with the proviso that G6 is replaced by G5.

Example (5a/G10) is identical to Example 5a with the proviso that G6 is replaced by G10.

Example (5b/G9) is identical to Example 5b with the proviso that G6 is replaced by G9.

Example (5b/G13) is identical to Example 5b with the proviso that G6 is replaced by G13.

Example (5c/G5 is identical to Example 5c with the proviso that G6 is replaced by G5.

Example (5c/G13) is identical to Example 5c with the proviso that G6 is replaced by G13.

Example G/6

A strand of middle blond undamaged human hair is coloured

-   -   6a) with a mixture of 15 g of 6% hydrogen peroxide solution and         a composition consisting of 5 g each of compositions A, B and         G6, and alternatively     -   6b) first with 15 g of 6% hydrogen peroxide solution, and then         with 5 g of a composition A, 5 g of composition B and 5 g of         composition G6, or     -   6c) first with 5 g of a composition A, 5 g of composition B and         5 g of composition G6, and then with 15 g of 6% hydrogen         peroxide solution.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. 10 g of a 2% strength aqueous citric acid gel are then applied to the strand. After contact for 5 minutes, the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (6a/G5) is identical to Example 6a with the proviso that G6 is replaced by G5.

Example (6a/G13) is identical to Example 6a with the proviso that G6 is replaced by G13.

Example (6b/G9) is identical to Example 6b with the proviso that G6 is replaced by G9.

Example (6b/G10) is identical to Example 6b with the proviso that G6 is replaced by G10.

Example (6c/G5) is identical to Example 6c with the proviso that G6 is replaced by G5.

Example (6c/G13) is identical to Example 6c with the proviso that G6 is replaced by G13.

Example G/9

A strand of blond undamaged human hair is coloured

-   -   9a) with a mixture of 10 g of 6% hydrogen peroxide solution and         a composition consisting of 5 g each of compositions C and G6,         and alternatively     -   9b) with 10 g of 6% hydrogen peroxide solution and 5 g of         composition C and 5 g of composition G6.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. 10 g of a 2% strength aqueous citric acid gel are then applied to the strand. After contact for 5 minutes, the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking bluish red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (9a/G5) is identical to Example 9a with the proviso that G6 is replaced by G5.

Example (9a/G13) is identical to Example 9a with the proviso that G6 is replaced by G3.

Example (9b/G9) is identical to Example 9b with the proviso that G6 is replaced by G9.

Example (9b/G10) is identical to Example 9b with the proviso that G6 is replaced by G10.

Example G/10

A strand of blond undamaged human hair is coloured

-   -   10a) with a mixture of 10 g of 6% hydrogen peroxide solution and         a composition consisting of 5 g each of compositions D1 and E11,         and alternatively     -   10b) first with 10 g of 6% hydrogen peroxide solution, and then         with 5 g of composition D1 and 5 g of composition E11, or     -   10c) first with 5 g of composition D1 and 5 g of composition El         1, and then with 10 g of 6% hydrogen peroxide solution.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. 10 g of a 2% strength aqueous citric acid gel are then applied to the strand. After contact for 5 minutes, the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking bluish red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (10a/D2) is identical to Example 10a with the proviso that D1 is replaced by D2.

Example (10a/D3) is identical to Example 10a with the proviso that D1 is replaced by D3.

Example (10a/D4) is identical to Example 10a with the proviso that D1 is replaced by D4.

Example (10a/D5) is identical to Example 10a with the proviso that D1 is replaced by D5.

Example (10b/D2) is identical to Example 10b with the proviso that D1 is replaced by D2.

Example (10b/D3) is identical to Example 10b with the proviso that D1 is replaced by D3.

Example (10b/D4) is identical to Example 10b with the proviso that D1 is replaced by D4.

Example (10b/D5) is identical to Example 10b with the proviso that D1 is replaced by D5.

Example (10c/D2) is identical to Example 10c with the proviso that D1 is replaced by D2.

Example (10c/D3) is identical to Example 10c with the proviso that D1 is replaced by D3.

Example (10c/D4) is identical to Example 10c with the proviso that D1 is replaced by D4.

Example (10c/D5) is identical to Example 10c with the proviso that D1 is replaced by D5.

Example (10d/E12) is identical to Example 10a with the proviso that E11 is replaced by E12.

Example (10d/E19) is identical to Example 10a with the proviso that E11 is replaced by E10.

Example (10d/E16) is identical to Example 10a with the proviso that E11 is replaced by E7.

Example (10e/E15) is identical to Example 10b with the proviso that E11 is replaced by E12.

Example (10e/E12) is identical to Example 10b with the proviso that E11 is replaced by E10.

Example (10e/E16) is identical to Example 10b with the proviso that E11 is replaced by E7.

Example (10f/E12) is identical to Example 10c with the proviso that E11 is replaced by E12.

Example (10f/E19) is identical to Example 10c With the proviso that E11 is replaced by E10.

Example (10f/E16) is identical to Example 10c with the proviso that E11 is replaced by E7.

Example G/11

A strand of brown undamaged human hair is coloured

-   -   11a) with a mixture of 10 g of 6% hydrogen peroxide solution and         a composition consisting of 5 g each of compositions C and E11,         and alternatively     -   11b) first with 10 g of 6% hydrogen peroxide solution, and then         with 5 g of composition C and 5 g of composition E11, or     -   11c) first with 5 g of composition C and 5 g of composition E11,         and then with 10 g of 6% hydrogen peroxide solution.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. 10 g of a 2% strength aqueous citric acid gel are then applied to the strand. After contact for 5 minutes, the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking bluish red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (11a/E12) is identical to Example 11a with the proviso that E11 is replaced by E12.

Example (11a/E19) is identical to Example 11a with the proviso that E11 is replaced by E10.

Example (11a/E16) is identical to Example 11a with the proviso that E11 is replaced by E7.

Example (11b/E15) is identical to Example 11b with the proviso that E11 is replaced by E10.

Example (11b/E19) is identical to Example 11b with the proviso that E11 is replaced by E12.

Example (11b/E12) is identical to Example 11b with the proviso that E11 is replaced by E7.

Example (11c/E12) is identical to Example 11c with the proviso that E11 is replaced by E12.

Example (11c/E19) is identical to Example 11c with the proviso that E11 is replaced by E10.

Example (11c/E15) is identical to Example 11c with the proviso that E11 is replaced by E7.

Example G/12

A strand of blond undamaged human hair is coloured

-   -   12a) with a mixture of 5 g of 6% hydrogen peroxide solution and         5 g of composition G6, and alternatively     -   12b) first with 5 g of 6% hydrogen peroxide solution, and then         with 5 g of a composition G6, or     -   12c) first with 5 g of a composition G6, and then with 5 g of 6%         hydrogen peroxide solution.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. After contact for 30 minutes, without being washed out, 10 g of a dye mixture F is applied to the hair. The hair is then combed through thoroughly, whereupon its pH becomes about 3. Then, after a contact period of 15 minutes, the hair is rinsed thoroughly with water and dried.

Example (12a/G5) is identical to Example 12a with the proviso that G6 is replaced by G5.

Example (12a/G13) is identical to Example 12a with the proviso that G6 is replaced by G13.

Example G/13

A strand of blond undamaged human hair is coloured with 10 g of composition G6, The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. After contact for 30 minutes, without being washed out, 10 g of a dye mixture F is applied to the hair. The hair is then combed through thoroughly, whereupon its pH becomes about 3. Then, after a contact period of 15 minutes, the hair is rinsed thoroughly with water and dried.

Example (13/G5) is identical to Example G/13 with the proviso that G6 is replaced by G5.

Example (13/G9) is identical to Example G/13 with the proviso that G6 is replaced by G9.

Example G/15

A strand of blond undamaged human hair is coloured with 10 g of a composition G6.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. After contact the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (15/G5) is identical to Example 15 with the proviso that G6 is replaced by G5.

Example (15/G9) is identical to Example 15 with the proviso that G6 is replaced by G9.

Example G/16

A strand of blond undamaged human hair is coloured

-   -   16a) with a mixture of 5 g of 6% hydrogen peroxide solution and         5 g of composition G6, and alternatively     -   16b) first with 5 g of 6% hydrogen peroxide solution, and then         with 5 g of a composition G6, or     -   16c) first with 5 g of a composition G6, and then with 5 g of 6%         hydrogen peroxide solution.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. 10 g of a 2% strength aqueous citric acid gel are then applied to the strand. After contact for 15 minutes, the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (16a/G5) is identical to Example 16a with the proviso that G6 is replaced by G5.

Example (16a/G9) is identical to Example 16a with the proviso that G6 is replaced by G9.

Example (16b/G10) is identical to Example 16b with the proviso that G6 is replaced by G10.

Example (16b/G13) is identical to Example 16b with the proviso that G6 is replaced by G13.

Example (16c/G13) is identical to Example 16c with the proviso that G6 is replaced by G13.

Example (16c/G5) is identical to Example 16c with the proviso that G6 is replaced by G5.

Example G/22

A strand of blond undamaged human hair is coloured with 10 g of a composition G6. Then the pH is adjusted in the range of pH 5 to 8 by adding citric acid.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. After contact the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (22/G5) is identical to Example G/22 with the proviso that G6 is replaced by G5.

Example (22/G13) is identical to Example G/22 with the proviso that G6 is replaced by G13.

Example G/23

A strand of brown undamaged human hair is coloured

-   -   11a) with a mixture of 15 g of 6% hydrogen peroxide solution and         a composition consisting of 5 g each of compositions C, D1 and         E11, and alternatively     -   11b) first with 10 g of 6% hydrogen peroxide solution, and then         with 5 g each of compositions C, D1 and E11 or     -   11c) first with 5 g each of compositions C, D1 and E11, then         with 10 g of 6% hydrogen peroxide solution.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. 10 g of a 2% strength aqueous citric acid gel are then applied to the strand. After contact for 5 minutes, the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking bluish red coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (23a/D2) is identical to Example 23a with the proviso that D1 is replaced by D2.

Example (23a/D3) is identical to Example 23a with the proviso that D1 is replaced by D3.

Example (23a/D4) is identical to Example 23a with the proviso that D1 is replaced by D4.

Example (23a/D5) is identical to Example 23a with the proviso that D1 is replaced by D5.

Example (23b/D2) is identical to Example 23b with the proviso that D1 is replaced by D2.

Example (23b/D3) is identical to Example 23b with the proviso that D1 is replaced by D3.

Example (23b/D4) is identical to Example 23b with the proviso that D1 is replaced by D4.

Example (23b/D5) is identical to Example 23b with the proviso that D1 is replaced by D5.

Example (23c/D2) is identical to Example 23c with the proviso that D1 is replaced by D2.

Example (23c/D3) is identical to Example 23c with the proviso that D1 is replaced by D3.

Example (23c/D4) is identical to Example 23c with the proviso that D1 is replaced by D4.

Example (23c/D5) is identical to Example 23c with the proviso that D1 is replaced by D5.

Example (23a/E12) is identical to Example 23a with the proviso that E11 Is replaced by E12.

Example (23a/E16) is identical to Example 23a with the proviso that E11 is replaced by E10.

Example (23a/E15) is identical to Example 23a with the proviso that E11 is replaced by E7.

Example (23b/E12) is identical to Example 23b with the proviso that E11 is replaced by E12.

Example (23b/E19) is identical to Example 23b with the proviso that E11 is replaced by E10.

Example (23b/E15) is identical to Example 23b with the proviso that E11 is replaced by E7.

Example (23c/E16) is identical to Example 23c with the proviso that E11 is replaced by E10.

Example (23c/E12) is identical to Example 23c with the proviso that E11 is replaced by E12.

Example (23c/E19) is identical to Example 23c with the proviso that E11 is replaced by E7.

Example (23a/D2/E712) is identical to Example 23a/D2 with the proviso that that E11 is replaced by E12.

Example (23a/D3/E15) is identical to Example 23a/D3 with the proviso that that E11 is replaced by E10.

Example (23a/D41E9) is identical to Example 23a/D4 with the proviso that E11 is replaced by E7.

Example (23b/D2/E19) is identical to Example 23b/D2 with the proviso that that E11 is replaced by E10.

Example (23b/D3/E12) is identical to Example 23b/D3 with the proviso that that E11 is replaced by E12.

Example (23b/D4/E16) is identical to Example 23b/D4 with the proviso that E11 is replaced by E7.

Example (23c/D2/E12) is identical to Example 23c/D2 with the proviso that that E11 is replaced by E12.

Example (23c/D3/E15) is identical to Example 23c/D3 with the proviso that that E11 is replaced by E10.

Example (23c/D4/E19) is identical to Example 23c/D4 with the proviso that E11 is replaced by E7.

Example G/24

A strand of blond undamaged human hair is coloured

-   -   24a) with a mixture of 5 g of 6% hydrogen peroxide solution and         a composition consisting of 5 g of composition E11 and         alternatively     -   24b) first with 5 g of 6% hydrogen peroxide solution, and then         with 5 g of composition 11 or     -   25c) first with 5 g of composition E11 and then with 5 g of 6%         hydrogen peroxide solution.

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. 10 g of a 2% strength aqueous citric acid gel are then applied to the strand. After contact for 5 minutes, the strand is rinsed thoroughly, shampooed and then dried.

A strong, intense, striking bluish red coloration having good fastness to washing and fastness to rubbing properties Is obtained.

Example (24a/E12) is identical to Example 24a with the proviso that E11 is replaced by E12.

Example (24b/E19 is identical to Example 24a with the proviso that E11 is replaced by E10.

Example (24c/E15) is identical to Example 24a with the proviso that E11 is replaced by E7.

Example (24b/E16) is identical to Example 24b with the proviso that E11 is replaced by E10.

Example (24b/E15) is identical to Example 24b with the proviso that E11 is replaced by E7.

Example (24b/E12) is identical to Example 24b with the proviso that E11 is replaced by E12.

Example (25c/E16) is identical to Example 25c with the proviso that E11 is replaced by E10.

Example (25c/E19) is identical to Example 25c with the proviso that E11 is replaced by E7.

Example (25c/E12) is identical to Example 25c with the proviso that E11 is replaced by E12.

Example G/25

A strand of blond undamaged human hair is coloured with

25a) 5 g of a composition according to the following table behentrimonium chloride 3.8 g cetylalcohol   4 g phenoxyethanol and isobutylparaben 0.5 g perfume 0.1 g Direct Dye of formula (6), wherein X⁻ is 0.5 g acetate monoethanolamine ad pH 6.5 Water ad100

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. After contact the strand is rinsed and then dried.

A strong, intense, striking coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (25a/G5) is identical to Example 25a with the proviso that Direct Dye of formula (6), is replaced by Direct Dye of formula (5), wherein X⁻ is formate.

Example (25a/G9) is identical to Example 25a with the proviso that Direct Dye of formula (6), is replaced by Direct Dye of formula (9), wherein X⁻ is acetate.

Example (25a/G13) is identical to Example 25a with the proviso that Direct Dye of formula (6), by Direct Dye of formula (13), wherein X⁻ is acetate.

Example G/26

26a)

2 g of a composition A according to the following table COMPOSITION A sodium stearat 11.0 g aluminium distearat  2.7 g sodium laurylsulfat(Duponol C)  1.0 g disperse silicic acid (Aerosil 200)  9.1 g hydroxypropylcellulose  2.7 g ammoniumpersulfat 19.0 g sodium metasilicat 12.0 g disodium salt of ethylentetraminacetic acid  1.0 g potassium persulfat 31.5 g

and 3.6 g of a composition B according to the following table COMPOSITION B water 188 g hydrogenperoxide  12 g are mixed to a homogenous mixture. This homogenous mixture is allowed to act on a strand of blond undamaged human hair for 30 minutes at about 22° C. After contact the strand is rinsed, shampooed.

Then the hair is coloured with 5 g of a composition according to the following table behentrimonium chloride 3.8 g cetylalcohol   4 g phenoxyethanol and Isobutylparaben 0.5 g perfume 0.1 g Direct Dye of formula (6), wherein X⁻ is 0.5 g acetate monoethanolamine ad pH 6.5 Water ad100

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. After contact the strand is rinsed and then dried.

A strong, intense, striking coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (26a/G5) is identical to Example 26a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (5), wherein X⁻ is formate.

Example (26a/G9) is identical to Example 26a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct Dye of formula (9), wherein X⁻ is acetate.

Example (26a/G10) is identical to Example 26a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (10), wherein X⁻ is acetate.

Example G/27

27a)

2 g of a composition A according to the following table COMPOSITION A sodium stearat 11.0 g aluminium distearat  2.7 g sodium laurylsulfat(Duponol C)  1.0 g disperse silicic acid (Aerosil 200)  9.1 g hydroxypropylcellulose  2.7 g ammoniumpersulfat 19.0 g sodium metasilicat 12.0 g disodium salt of ethylentetraminacetic acid  1.0 g potassium persulfat 31.5 g Direct Dye of formula (6), wherein X⁻ is   10 g acetate

and 4 g of a composition B according to the following table COMPOSITION B water 188 g hydrogenperoxide  12 g are mixed to a homogenous mixture. This homogenous mixture is allowed to act on a strand of blond undamaged human hair for 30 minutes at about 22° C. After contact the strand is rinsed, shampooed and dried.

Example (27a/G5) is identical to Example 27a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (5), wherein X⁻ is formate

Example (27a/G13) is identical to Example 27a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (13), wherein X⁻ is acetate.

Example (27a/G9) is identical to Example 27a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (6), wherein X⁻ is acetate.

Example G/28

28a)

2 g of a composition A according to the following table COMPOSITION A sodium stearat 11.0 g aluminium distearat  2.7 g sodium laurylsulfat(Duponol C)  1.0 g disperse silicic acid (Aerosil 200)  9.1 g hydroxypropylcellulose  2.7 g ammoniumpersulfat 19.0 g sodium metasilicat 12.0 g disodium salt of ethylentetraminacetic acid  1.0 g potassium persulfat 31.5 g Direct Dye of formula (6), wherein X⁻ is   10 g acetate

and 4 g of a composition B according to the following table COMPOSITION B water 188 g hydrogenperoxide  12 g are mixed to a homogenous mixture. This homogenous mixture is allowed to act on a strand of blond undamaged human hair for 30 minutes at about 22° C. After contact the strand is rinsed and shampooed.

Then the hair is coloured with 5 g of a composition according to the following table behentrimonium chloride 3.8 g cetylalcohol   4 g phenoxyethanol and Isobutylparaben 0.5 g perfume 0.1 g Direct Dye of formula (6), wherein X⁻ is 0.5 g acetate monoethanolamine ad pH 6.5 Water ad100

The-colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. After contact the strand is rinsed and then dried.

A strong, intense, striking coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (28a/G5) is identical to Example 28a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (5), wherein X⁻ is formate.

Example (28a/G10) is identical to Example 28a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (10), wherein X⁻ is succinate.

Example (28a/G9) is identical to Example 28a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (9), wherein X⁻ is acetate.

Example G/30

30a)

2 g of a composition A according to the following table COMPOSITION A sodium stearat 11.0 g aluminium distearat  2.7 g sodium laurylsulfat(Duponol C)  1.0 g disperse silicic acid (Aerosil 200)  9.1 g hydroxypropylcellulose  2.7 g ammoniumpersulfat 19.0 g sodium metasilicat 12.0 g disodium salt of ethylentetraminacetic acid  1.0 g potassium persulfat 31.5 g is mixed with 2 g of a composition C,

and 4 g of a composition B according to the following table COMPOSITION B water 188 g hydrogenperoxide  12 g to a homogenous mixture. This homogenous mixture is allowed to act on a strand of blond undamaged human hair for 30 minutes at about 22° C. After contact the strand is rinsed and shampooed.

Then the hair is coloured with 5 g of a composition according to the following table behentrimonium chloride 3.8 g cetylalcohol   4 g phenoxyethanol and Isobutylparaben 0.5 g perfume 0.1 g Direct Dye of formula (6), wherein X⁻ is 0.5 g acetate monoethanolamine ad pH 6.5 Water ad100

The colouring mixture is allowed to act on the hair for 30 minutes at about 22° C. After contact the strand is rinsed and then dried.

A strong, intense, striking coloration having good fastness to washing and fastness to rubbing properties is obtained.

Example (30a/G5) is identical to Example 30a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (5), wherein X⁻ is formate.

Example (30a/G10) is identical to Example 30a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (10), wherein X⁻ is succinate.

Example (30a/G9) is identical to Example 30a with the proviso that direct dye of formula (6), wherein X⁻ is chloride is replaced by direct dye of formula (9), wherein X⁻ is acetate.

Example G/31

31a)

2 g of a composition A according to the following table COMPOSITION A sodium stearat 11.0 g aluminium distearat  2.7 g sodium laurylsulfat(Duponol C)  1.0 g disperse silicic acid (Aerosil 200)  9.1 g hydroxypropylcellulose  2.7 g ammoniumpersulfat 19.0 g sodium metasilicat 12.0 g disodium salt of ethylentetraminacetic acid  1.0 g potassium persulfat 31.5 g is mixed with a 2.0 g of a composition E11

and 6 g of a composition B according to the following table COMPOSITION B water 188 g hydrogenperoxide  12 g to a homogenous mixture. This homogenous mixture is allowed to act on a strand of blond undamaged human hair for 30 minutes at about 22° C. After contact the strand is rinsed, shampooed and dried.

Example (31a/E12) is identical to Example 31 a with the proviso that E11 is replaced by E12.

Example (31b/E15) is identical to Example 31 a with the proviso that E11 is replaced by E10.

Example (31c/E19) is identical to Example 31 a with the proviso that E11 is replaced by E7.

Example G/32

32a)

2 g of a composition A according to the following table COMPOSITION A sodium stearat 11.0 g aluminium distearat  2.7 g sodium laurylsulfat(Duponol C)  1.0 g disperse silicic acid (Aerosil 200)  9.1 g hydroxypropylcellulose  2.7 g ammoniumpersulfat 19.0 g sodium metasilicat 12.0 g Di sodium salt of ethylentetraminacetic acid  1.0 g potassium persulfat 31.5 g

is mixed with a 2.0 g of a COMPOSITION C as given in example G and 2.0 g of a direct dye of formula (6), wherein X⁻ is acetate and 8 g of a COMPOSITION B according to the following table COMPOSITION B water 188 g hydrogenperoxide  12 g to a homogenous mixture. This homogenous mixture is allowed to act on a strand of blond undamaged human hair for 30 minutes at about 22° C. After contact the strand is rinsed, shampooed and dried.

Example (32a/G5) is identical to Example 32a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (5), Wherein X⁻ is formate.

Example (32a/G13) is identical to Example 32a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (13), wherein X⁻ is acetate.

Example (32a/G9) is identical to Example 32a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (9), wherein ⁻ is acetate.

Example G/33

33a) Composition (A′) polyglycerol alcohol with 2 mols of glycerol  4.0 g polyglycerol alcohol with 4 mols of glycerol  5.69 g of 78% (M.A.) oil acid  3.0 g oleic amine with 2 mols ethylenoxide  7.0 g available from ETHOMEEN O12 from AKZO laurylamine succinamate of  3.0 g diethylaminopropylene, salt of sodium with 55%. oil alcohol  5.0 g diethynolamide of oil acid  12.0 g propylenglycol  3.5 g ethylenalcohol  7.0 g monobutylether of diethylenglycol  0.5 g monomethylether of propylenglycol  0.5 g sodium metabisulfite as solution a 35% 0.455 g ammonium acetate  0.8 g paraphenylendiamine  0.35 g 1,3-dihydroxybenzene  0.4 g 3-amino phenol  0.03 g 2,4-diamino-1-(β-hydroxyethyloxy)benzene, 0.012 g 2HCl 1,3-bis-[(4-aminophenyl)2-hydroxyethyl)- 0.037 g amino]-2-propanol, 4HCl 1,3-dihydroxy-2-methyl-benzene  0.2 g antioxidant qs parfume qs ammonia 20% ofNH₃  10.0 g water   100 g Composition (B′) direct dye of formula (6), wherein X⁻ is   20 g acetate in powder form oil of parafine    3 g cationic polymeric powder (Merquat 280 Dry   10 g de Calgon) sawdust   100 g Composition (C′): hydrogenperoxide 20% by volume

Just before the colouration of human hair a mixture of 1 equivalent of weight of Composition (A′), 01 equivalent of weight of compostion (B′) and 1 equivalent of weight of composition (C′) is mixed.

The pH of the mixture is adjusted to 9.8.

The colouring mixture is applied on human grey hair. This mixture is allowed to act on a strand of blond undamaged human hair for 30 minutes. After contact the strand is rinsed, shampooed and dried.

Example (33a/G5) is identical to Example 33a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (5), wherein X⁻ is formate.

Example (33a/G13) is identical to Example 33a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (13), wherein X⁻ is acetate.

Example (33a/G9) is identical to Example 33a with the proviso that G6 is replaced by direct dye of formula (9), wherein X⁻ is acetate.

Example G/34

34a) Composition (B′) direct dye of formula (6), wherein X⁻ is  20 g acetate in powder form Oil of parafine  3 g cationic polymeric powder (Merquat 280 Dry  10 g de Calgon) sawdust 100 g Composition (C′): hydrogenperoxide 20% by volume 100 g

Just before the colouration of human hair a mixture of 1 equivalent of weight of Composition (A′), and 1 equivalent of weight of composition (C′) is mixed.

The pH of the mixture is adjusted to 9.8.

The colouring mixture is applied on human grey hair. This mixture is allowed to act on a strand of blond undamaged human hair for 30 minutes. After contact the strand is rinsed, shampooed and dried.

Example (34a/G5) is identical to Example 34a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (5), wherein X⁻ is formate.

Example (34a/G9) is identical to Example 34a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (9), wherein X⁻ is acetate.

Example (34a/G10) is identical to Example 34a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (10), wherein X⁻ is succinate.

Example G/35

35a) Composition (B′) direct dye of formula (6), wherein X⁻ is  20 g acetate, powder form Oil of parafine  3 g cationic polymeric powder (Merquat 280 Dry  10 g de Calgon) sawdust 100 g Composition (C′): hydrogenperoxide 20% by volume 100 g

Just before the colouration of human hair a mixture of 1 equivalent of weight of Composition (A′), and 1 equivalent of weight of composition (C′) is mixed.

The pH of the mixture is adjusted to 9.8 with ammonia 20% by volume.

The colouring mixture is applied on human grey hair. This mixture is allowed to act on a strand of blond undamaged human hair for 30 minutes. After contact the strand is rinsed, shampooed and dried.

Example (35a/G13) is identical to Example 35a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (13), wherein X⁻ is acetate.

Example (35a/G9) is identical to Example 35a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (9), wherein X⁻ is acetate.

Example (35a/G5) is identical to Example 35a with the proviso that direct dye of formula (6), wherein X⁻ is acetate is replaced by direct dye of formula (5), wherein X⁻ is formate.

Example 36

26 g of the dye of formula

are heated to 60° C. in 60 g of methanol. 10 g of potassium acetate are added thereto and stirring is carried out for 4 hours at 60° C. The mixture is then allowed to cool to room temperature and is filtered. The filter cake is then washed with 5 g of methanol, yielding a residue of 6.5 g of almost colourless salt, which consists almost entirely of potassium chloride. The methanolic mother liquor is concentrated to dryness by evaporation in a rotary evaporator, yielding 29 g of a dark-violet powder which is substantially the acetate of the dye that was used and has a chloride content of only 1.6% (the starting product contains 14.1%) and a water solubility of over 25%. The water solubility of the chloride of the dye used is only 3.7%.

Example 37

50 g of the same dye as in Example 36 are heated to 60° C. in 190 g of isopropanol, and 23.4 g of potassium acetate are then added thereto. The temperature is raised to 80° C. and maintained for 7 hours. The hot solution is then filtered through a pre-heated suction filter and the residue is washed with a small amount of isopropanol. About 14 g of almost colourless salt (potassium chloride) are obtained. Upon cooling to room temperature, the acetate of the dye crystallises from the mother liquor in the form of attractive crystals. Filtration, washing with a small amount of isopropanol and drying yield 38.5 g in very pure form and with a chloride content of only 0.6%. The mother liquor is concentrated to dryness by evaporation in vacuo at a maximum of 50° C., yielding 21 g of a mixture of about 85% acetate of the dye and 15% potassium acetate. It is possible to prepare from the two fractions a clear, stable, 30% aqueous solution.

Example 38

10.3 g of the same starting material as in Example 36 and 3.0 g of potassium carbonate are suspended in 50 g of isopropanol and heated to 60° C. 4 g of anhydrous lactic acid are then added thereto, and stirring is carried out for 4 hours at 60° C. The mixture is then diluted with a further 64 g of isopropanol and the temperature is raised to 80° C. in order to dissolve all the dye. Clarifying filtration is carried out through a suction filter pre-heated to 80° C., and the residue is then washed with 18 g of isopropanol, yielding a potassium chloride residue of 2.47 g, which corresponds to about 94% of the expected amount. The filtrate is allowed to cool, with stirring, whereupon the lactate of the dye precipitates in crystalline form. Filtration, washing and drying yield 8.84 g of dark dye powder whose solubility in water is over 20%, whereas the solubility of the starting product is only 3.7%.

Example 39

The procedure is exactly as in Example 38 at first, but 3.3 g of propionic acid are added instead of the lactic acid and the temperature is immediately raised to 80° C. After 2 hours, clarifying filtration is carried out through a pre-heated suction filter, and the residue is washed with 65 g of isopropanol. The largely colourless clarified residue is 2.85 g and consists of 44.7% chloride. The filtrate is concentrated to about ⅓ as gently as possible in a rotary evaporator and then allowed to cool, with stirring. The resulting dye is filtered off with suction, washed with 63 g of isopropanol and dried, yielding 8.2 g of crystal powder having a chloride content of only 1.4% (about {fraction (1/10)} of the original chloride content). The solubility of the propionate of the dye in water is likewise over 30%.

Example 40

10.7 g of the dye of formula

are suspended in 70 g of isopropanol, together with 2.6 g of potassium formate, and heated to 80° C. From about 62° C., the starting materials are largely dissolved and salt crystals are immediately observed on the wall of the flask. After 4 hours, clarifying filtration is carried out through a pre-heated suction filter, and the residue is then washed with 47 g of isopropanol. The dry residue weighs 2.04 g and consists almost entirely of potassium chloride. Upon cooling, the formate of the dye crystallises from the filtrate in the form of violet crystals; yield 7.4 g. The mother liquor is concentrated to dryness by evaporation in vacuo and yields a further 3.75 g of the formate of the dye of almost equal purity. The chloride contents of those two fractions are only 0.5% and 0.23%, respectively, which likewise indicates an anion exchange of over 95%. Accordingly, their water solubility is over 30%, whereas that of the chloride used is only 0.35%.

Example 41

10.3 g of the dye chloride from Example 36 are suspended in 50 g of isopropanol, with 3.0 g of potassium carbonate and 11.5 g of stearic acid, and heated to 60° C. After 4 hours, the temperature is raised to 80° C., a further 200 g of isopropanol are added, and clarifying filtration is carried out through a heated suction filter at 80° C. 3.1 g of almost colourless salt remain on the filter. Upon cooling to room temperature, the stearate of the dye precipitates from the mother liquor in the form of a crystalline precipitate. The latter is filtered off, washed with 30 g of isopropanol and dried, yielding 10.7 g of a brown-violet dye powder. By concentration of the mother liquor it is readily possible to obtain a further 5 g of product of equally good quality.

Example 42

4.0 g of the oxazine dye of formula

are placed, together with 0.72 g of potassium carbonate, in 13 g of isopropanol. 1.2 g of trifluoroacetic acid are added to the highly fluid suspension, whereupon the mixture becomes viscous. However, it rapidly becomes highly fluid again upon heating. Stirring is carried out for 4 hours at a temperature of 60° C., the temperature is then raised to 80° C., and the precipitated salt is filtered off while hot. The residue is rinsed with a small amount of isopropanol. Upon cooling, with stirring, the trifluoroacetate of the dye precipitates from the mother liquor in the form of a crystalline precipitate. The latter is filtered off, washed with a small amount of isopropanol and dried, yielding 1.9 g of a dye powder whose solubility in water is over 1.5%, whereas the solubility of the starting product is less than 0.4%. Neither the isolated product nor the mother liquor, which still contains a large amount of product, exhibit any decomposition. From the nitrate that is still present (about 3%) it is possible to conclude that the exchange has taken place to the extent of about 82%. A further 2.2 g of dye of equal quality can be obtained from the mother liquor by gentle concentration.

Example 43

4 g of the dye of formula

and 1.5 g of potassium acetate are suspended in 20 g of isopropanol and stirred for 5 hours at 60° C. Clarifying filtration is then carried out while hot. The salt residue is 1.12 g. The acetate of the dye crystallises from the mother liquor. Filtration and washing with isopropanol yield 3.43 g (dry) of dark crystal powder whose solubility in water has increased one hundred fold from <0.03% to 3%.

Example 44

If in Example 43 the potassium acetate is replaced by 1.3 g of potassium formate and heating is carried out for 4 hours at 80° C., there are obtained, with an otherwise identical procedure and working up, 3.54 g of the formate of the dye, whose solubility in water is about 1.2%. The salt residue from the clarifying filtration is 1.0 g.

Example 45

1.29 g of potassium acetate are added to 3 g of the compound of formula

in 15 g of methanol, and stirring is carried out for 4 hours at a temperature of 55° C. A highly fluid suspension is obtained. Upon cooling, no dye precipitates and the clarifying filtration can therefore be carried out at room temperature; clarified residue 1.1 g. The mother liquor is concentrated to dryness by evaporation under gentle conditions at 50° C. and 70 mbar, yielding 3.1 g of the acetate of the dye which, in contrast to the starting product, is excellently soluble in water.

Example 46

By means of the procedure described in Example 36 it is also possible to convert the chloride of the optical brightener of the following formula into the acetate:

Example 47

By means of the procedure described in Example 36 it is also possible to convert the chloride of the UV absorber of the following formula into the acetate:

Example 48

By means of the procedure described in Example 36 it is also possible to convert the chloride of the cationic dye of the following formula into the acetate:

Example 49

By means of the procedure described in Example 36 it is also possible to convert the chloride of the cationic dye of the following formula into the acetate:

Example 50

By means of the procedure described in Example 36 it is also possible to convert the chloride of the cationic dye of the following formula into the acetate: 

1. A process for converting sparingly soluble salts of cationic organic compounds and inorganic acids into more readily soluble salts of organic acids, which process comprises a) preparing a sparingly water-soluble salt of the cationic organic compound with the anion of an inorganic acid, b) adding thereto, in a monohydric aliphatic alcohol, an alkali metal salt of an organic acid, c) filtering off the resulting sparingly soluble alkali metal salt of the inorganic acid, and d) optionally converting the resulting solution into a solid form.
 2. A process according to claim 1, wherein the cationic organic compound is a UV absorber, a soft-handle agent for textiles, an antimicrobial agent, an optical brightener or a dye.
 3. A process according to claim 2, wherein the dye is a cationic dye.
 4. A process according to claim 3, wherein the cationic dye is a monoazo, disazo or a hydrazon dye.
 5. A process according to claim 3, wherein the dye is a dye of formula

wherein R₁ and R₂ are each independently of the other hydrogen, C₁-C₄alkyl, halogen or nitro, R₃ and R₄ are each independently of the other unsubstituted C₁-C₄alkyl or C₁-C₄alkyl substituted by OH, C₁-C₄alkoxy, halogen, CN or by phenyl, X₁ and X₂ are each independently of the other hydrogen, C₁-C₄alkyl, C₁-C₄alkoxy or halogen, R₅ is hydrogen or C₁-C₄alkyl, R₆ is hydrogen, phenyl, C₁-C₁₂alkyl or C₅-C₈cycloalkyl, each of which may be unsubstituted or substituted by OH, C₁-C₄alkoxy, halogen, CN, or R₆ is C₁-C₄alkyl substituted by phenyl or by C₅-C₈cycloalkyl, or wherein R₅ and R₆, together with the nitrogen atom linking them, form a piperazine ring which is substituted by C₁-C₈alkyl or by phenyl groups on the nitrogen atom not bonded to the phenyl ring or which is quaternised at the nitrogen atom not bonded to the phenyl ring by means of two of the groups, the C₁-C₈alkyl and phenyl groups mentioned as substituents on the nitrogen atom of the piperazine ring being unsubstituted or substituted by OH, C₁-C₄alkoxy, halogen, CN or by phenyl, and wherein R₇ and R₈ are each independently of the other a C₁-C₈alkyl radical or an unsubstituted or substituted benzyl radical, and R₉ is hydrogen, C₁-C₈alkyl, C₁-C₈alkoxy, cyanide or halide, and n is a whole number in the range from 2 to 12, and, wherein X⁻ is an anion.
 6. A process according to claim 5, wherein the dye is a dye of formula

wherein X⁻ is an anion.
 7. A process according to claim 1, wherein the anion of the inorganic acid, is an iodide, bromide, chloride, sulfate, hydrogen sulfate, methyl sulfate, phosphate, borfluorate or perchlorate.
 8. A process according to claim 1, wherein the organic acid salt is formate, acetate, propionate, butyrate, monochloroacetate, trifluoroacetate, tartrate, oxalate, stearate, maleate, acrylate, succinate, citrate, lactate, methanesulfonate or ethanesulfonate.
 9. A process according to claim 8, wherein the organic acid salt is a formate, acetate, stearate, propionate, citrate, lactate or trifluoroacetate.
 10. A process according to claim 1, wherein the alkali metal salt is lithium salt, sodium salt or potassium salt.
 11. A process according to claim 1, wherein the alcohol is methanol, ethanol, n- or iso-propanol, n-, iso- or tert-butanol.
 12. A process according to claim 11, wherein the alcohol is methanol, ethanol or isopropanol.
 13. A salt of a cationic compound, which salt has been prepared by the process according to claim
 1. 14. A dye of formula

wherein R₁ and R₂ are each independently of the other hydrogen, C₁-C₄alkyl, halogen or nitro, R₃ and R₄ are each independently of the other unsubstituted C₁-C₄alkyl or C₁-C₄alkyl substituted by OH, C₁-C₄alkoxy, halogen, CN or by phenyl, X₁ and X₂ are each independently of the other hydrogen, C₁-C₄alkyl, C₁-C₄alkoxy or halogen, R₅ is hydrogen or C₁-C₄alkyl, R₆ is hydrogen, phenyl, C₁-C₁₂alkyl or C₅-C₈cycloalkyl, each of which may be unsubstituted or substituted by OH, C₁-C₄alkoxy, halogen, CN, or R₆ is C₁-C₄alkyl substituted by phenyl or by C₅-C₈cycloalkyl, or wherein R₅ and R₆, together with the nitrogen atom linking them, form a piperazine ring which is substituted by C₁-C₈alkyl or by phenyl groups on the nitrogen atom not bonded to the phenyl ring or which is quaternised at the nitrogen atom not bonded to the phenyl ring by means of two of the groups, the C₁-C₈alkyl and phenyl groups mentioned as substituents on the nitrogen atom of the piperazine ring being unsubstituted or substituted by OH, C₁-C₄alkoxy, halogen, CN or by phenyl, and wherein R₇ and R₈ are each independently of the other a C₁-C₈alkyl radical or an unsubstituted or substituted benzyl radical, and R₉ is hydrogen, C₁-C₈alkyl, C₁-C₈alkoxy, cyanide or halide, and n is a whole number between 2 and 12, and wherein X⁻ is formate, acetate, propionate, butyrate, monochloroacetate, trifluoroacetate, tartrate, oxalate, maleate, acrylate, succinate, citrate, lactate, stearate, methanesulfonate or ethanesulfonate.
 15. A method of dyeing natural or synthetic material by treating the material with a cationic dye according to claim
 13. 16. A method according to claim 15, wherein the material is hair.
 17. A cationic dye according to claim 13 wherein the dye is a liquid preparation.
 18. A cationic dye according to claim 17, wherein the liquid preparation is a hair dye.
 19. A cationic dye according to claim 14 wherein the dye is a liquid preparation.
 20. A cationic dye according to claim 19 wherein the liquid preparation is a hair dye. 